Do forensic science courses have a good scope in India or abroad?

The scope of forensic science is vast. You can get jobs in various government and private sectors. The study will improve your skills and knowledge. You also may employ in forensic laboratories, detective offices, banks and other government and private agencies.

Yes, it is a very good stream if you are some kind of detective. Talking about the scope, it is a multi-disciplinary branch so it has very wide scope and opportunities in India as well as abroad. You should read this article: https://www.shiksha.com/careers/forensic-science-technician-53