Hello Harisankar,
Here is the name of the College for b.sc astrophysics in India;
1. Indian Institute of Astrophysics, Bengaluru.
2. IISER Bhopal
3. IISER Kolkata
4. IISER Mohali
5. IISER Pune
To get admission in these colleges yiu need to qualify the GATE and JEST exam.
Hope this will help you. Best of luck.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile