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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 ON8o31TuPMZGyavfPiwJrvd/nw9XuEhvOZvkIh6SiNEc/eL8jdM+7dANIXsNqAOd
 x8uC78/edys93f7aKIZ+RA==

<SEC-DOCUMENT>0001140361-03-002603.txt : 20030725
<SEC-HEADER>0001140361-03-002603.hdr.sgml : 20030725
<ACCEPTANCE-DATETIME>20030725153133
ACCESSION NUMBER:		0001140361-03-002603
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030724
FILED AS OF DATE:		20030725

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COASTAL BANCORP INC
		CENTRAL INDEX KEY:			0000919805
		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
		IRS NUMBER:				760428727
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5718 WESTHEIMER
		STREET 2:		SUITE 600
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77057
		BUSINESS PHONE:		7134355000

	MAIL ADDRESS:	
		STREET 1:		5718 WESTHEIMER
		STREET 2:		SUITE 600
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77057

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COASTAL BANC SAVINGS ASSOCIATION
		DATE OF NAME CHANGE:	19970110

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COASTAL BANCORP INC/TX/
		DATE OF NAME CHANGE:	19940718

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FLOWERS D FORT JR
		CENTRAL INDEX KEY:			0001057835
		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24526
		FILM NUMBER:		03803583

	BUSINESS ADDRESS:	
		STREET 1:		2001 KIRBY DRIVE SUITE 1210
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77056
		BUSINESS PHONE:		(713)435-5327

	MAIL ADDRESS:	
		STREET 1:		COASTAL BANCORP INC
		STREET 2:		5718 WESTHEIMER SUITE 600
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77057
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType>
<periodOfReport>2003-07-24</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000919805</issuerCik>
        <issuerName>COASTAL BANCORP INC</issuerName>
        <issuerTradingSymbol>CBSA</issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
            <rptOwnerCik>0001057835</rptOwnerCik>
            <rptOwnerName>FLOWERS D FORT JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle></officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeSecurity>
<securityTitle>
<value>Common Stock CUSIP #19041P105</value>
</securityTitle>
<transactionDate>
<value>2003-07-24</value>
</transactionDate>
<transactionCoding>
<transactionFormType>4</transactionFormType>
<transactionCode>P</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionTimeliness>
<value></value>
</transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value>90</value>
</transactionShares>
<transactionValue>
<value>30.58</value>
</transactionValue>
<transactionAcquiredDisposedCode>
<value>A</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>275456</value>
<footnoteId id="F1"/>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value></value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeSecurity>
<footnotes>
<footnote id="F1">Mr. Flowers owns 5,846 shares directly and 269,610 shares indirectly in trusts.</footnote>
</footnotes>
<ownerSignature>
<signatureName>D. Fort Flowers, Jr.</signatureName>
<signatureDate>2003-07-24</signatureDate>
</ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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