I downloaded a game in sfv format and I heard that there is a way to make iso so I can install it.Please help me

I think UltraISO will create them -- but it's not free ($30).

ISO CD DVD image creator, editor and ISZ DMG DAA UIF to ISO converter - UltraISO can extract/create/edit/convert CD and DVD image files directly, make bootable CDs and convert ISZ DMG DAA UIF to ISO.
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Here's a thread that says that it's not necessary to make an ISO image to install it:

Problem with .sfv files

There are other ISO generators. I'm not sure if they'll take an sfv file to an ISO.

MagicISO - Convert BIN to ISO, Create, Edit, Burn, Extract ISO file, ISO/BIN converter/extractor/editor