There are many colleges available in India which offer B.Sc in Astronomy so you can consider any one of themas per your interest and convenience -

JNTU College of Engineering, Hyderabad

Indian Institute of Astrophysics, Bangalore

Osmania University

Indian Institute of Science, Bangalore

Birla Institute of Technology & Sciences, Pilani

Punjab University

Institute of Fundamental Research, Tamil Nadu

Astrophysics, Tata Institute of Fundamental Research, Pune etc.

Hope this helps!!!