Kamal, Netaji Subash National Institute of Sports, Patiala has few Academic courses. While you can check them at: https://nsnis.org/ , to give you a gist, the courses are:

Diploma in Sports Coaching

M.Sc in Sports Coaching

Skill Development Courses

Certificate Courses

PG Diploma in Sports Medicine.

They have a Sai Training Centre but that is for students who have excelled at junior level. So this is Sports Institute is more of a Coaching Centre for those who want to become coaches. And not players or aspirants. You did mention that you like playing sports a lot but you haven't mentioned whether you play or played in any tournaments at junior level. Because there is a protocol for playing for the country. You join sub junior levels first, then juniors and move to the National team. If you like to take up Football as a professional sport, you have to join any coaching centre.