Hii Rachna R.

Basically Astrophysics is application of physics to understand the Astronomy. There are very few private institutions offering courses on this. But some of the most reputed government colleges who have Astrophysics in their curriculum are

1. Aryabhatta research institute for observational science(ARIES), Nainital

2. Indian institute of Astrophysics, Bengaluru

3. Indian institute of science education and research(IISER).

4. Indian institute of science, Bengaluru

5. Indian institute of space science and technology, Thiruvananthapuram sponsored by ISRO. 

6. Inter-university centre for astronomy and astrophysics, Pune.

7. Raman research institute, Bangalore

These are sponsored by Government of India(GOI), Department of science and technology(DST), Indian space research organisation(ISRO). You can also go for B.Tech in Aerospace engineering if you are aspiring to be an Astrophysicist in future.