Yes you can do Bsc or related courses in Film making after your Btech. The eligibility may vary college to college.

Some of the colleges providing this course are:

• St Pauls Institute of Communication Education, Bangalore
• Chandigarh University
• GD Goenka University
• MIT School of Film and Television, Pune
• Whistling woods International, Maharashtra

Check the official site for more information.

Good Luck.