Yes, it is possible to do MA in journalism after  a B.Sc. You just need to be sure that you are ready for a change in your stream. YOu can apply to any of the colleges that offer PG or Master in Journalism. most of the colleges have there own entrance test which usually is of moderate level. The application process, usually, starts from March.

You can check Top media institutes https://media.careers360.com/articles/top-mass-communication-colleges-in-india