Dear aspirant !

Hope you are doing great ! Jee mains and sat exam both are different thing however sat exam is slightly easy than jee ,but not a cup of tea for everyone ,it depends on individual to individual how they deal ,if you want to prepare for both then yes you can ,but remember that sat exam contains reading portion ,english portion which will not be covered through jee mains otherwise rest can be covered with jee preparation ,almost math syllabus is same for both . So beleive in yourself and give the both with full hope and dedication.

Hope it helps you !

Thank you