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Is it possible to configure Sigil in that way?
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Configure Sigil to
automatically do it that way? No. New ePubs will always have a unique ID automatically generated. A unique identifier is required by the ePub specs, afterall (required to BE there, there is no mechanism to enforce of the actual uniqueness of said identifier in ePub). And since Sigil won't yet know what the ISBN of your brand new ePub might be, it will generate a UUID to ensure compliance in the meantime.
It's quite trivial to
change your ePub to use the ISBN identifier as the unique identifier (in Sigil) and get rid of the autogenerated UUID at any time, however:
Add the ISBN metadata (either through the metadata editor or add it manually in the OPF). Open the OPF file and add an id attribute to the isbn dc:indentifier entry you just created (I often use "isbn" but just so long as it's not the same as the "unique-identifier" attribute of the "package" element). Then change the "unique-identifier" attribute of the "package" element to match the id you just created for your ISBN entry. Save the epub and delete the entire <dc:identifier></dc:identifier> entry for the old UUID from the OPF.