Okay so you mean you've completed your graduation of btech already in CS branch and now you want to be a part of IIT BOMBAY. Yes it's possible. You can get a seat there for MTech. But for that you'll need to prepare and score very well in the GATE entrance examination.

To have a detailed information about same, do Refer to our website..

https://engineering.careers360.com/articles/iit-bombay-mtech-admission

Best wishes. Thank you.