<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-07-10</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001740547</issuerCik>
        <issuerName>Urovant Sciences Ltd.</issuerName>
        <issuerTradingSymbol>UROV</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001290166</rptOwnerCik>
            <rptOwnerName>QVT Associates GP LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>444 MADISON AVENUE, 21ST FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001771138</rptOwnerCik>
            <rptOwnerName>QVT Financial Investment Cayman Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>190 ELGIN AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>On July 10, 2019, the board of directors of Roivant Sciences Ltd. (&quot;Roivant&quot;) adopted changes to Roivant's internal governance concerning Roivant's dispositive power over the Common Shares and other matters relating to oversight of Roivant's business and governance.  As a result of these changes, Roivant's shareholders (including the Reporting Persons) no longer have the right to override certain decisions of Roivant's board of directors concerning dispositions of the Common Shares via a unanimous vote (and each thus no longer has the individual right to veto dispositive decisions of Roivant's board of directors), and so have ceased to have beneficial ownership of the Common Shares directly owned by Roivant. Roivant's ownership of the Issuer's Common Shares remains unchanged and this filing is not being made as a result of the purchase or sale of Common Shares of the Issuer by any party, including the Reporting Persons.</remarks>

    <ownerSignature>
        <signatureName>/s/ Nicholas Brumm</signatureName>
        <signatureDate>2019-07-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
