Can I pursue M.Sc in Economics if I have done B.Tech? If yes, which college should I go for?

Why not! You can consider below listed colleges as they are known for quality education and exposure :Delhi University, Jawaharlal Nehru University, Lovely Professional University, Jamia Mililia Islamia University, University of Mumbai, University of Hyderabad, Sri Ram College of Commerce, Lady Shri

Yes, you can pursue M.Sc.