MSc in Environmental Biotechnology is a very niche course that is offered by very few universities in India, Cochin University of Science And Technology (CUSAT) being one of them. Personally, I have come across very few schools of Environmental Studies in Indian universities that offer this program.

But then if you are interested then nothing should come between you and your choice. You may look at some of the IITs, IISERs, and other top universities if they provide this course or not and whether or not you are eligible for it. If you are not getting them, then CUSAT is fine as well.