<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-09-19</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001051717</issuerCik><issuerName>AMERUS GROUP CO/IA</issuerName>        <issuerTradingSymbol>AMH</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001069771</rptOwnerCik><rptOwnerName>GODLASKY THOMAS C</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>699 WALNUT STREET</rptOwnerStreet1><rptOwnerStreet2>SUITE 2000</rptOwnerStreet2><rptOwnerCity>DES MOINES</rptOwnerCity><rptOwnerState>IA</rptOwnerState><rptOwnerZipCode>50309</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>EVP &amp; Chief Investment Officer</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-09-19</value></transactionDate><deemedExecutionDate><value>2003-09-19</value></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>58000</value></transactionShares><transactionPricePerShare><value>34.7234</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value><footnoteId id="F1" /></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>14766.26</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>13202.65</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By 401(K) Plan</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>672</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Daughter</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>12122</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Spouse</value></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><footnotes><footnote id="F1">The securities were originally purchased under the issuer's executive stock purchase plan in 1999 with a loan from a third party financial institution and were sold to repay such loan which comes due in March of 2004.</footnote></footnotes><remarks></remarks><ownerSignature><signatureName>/s/ Jeananne M. Celander, attorney-in-fact</signatureName><signatureDate>2003-09-22</signatureDate></ownerSignature></ownershipDocument>

