There are many best biomedical engineering colleges in Tamil Nadu. Some of the college list is published through careers 360 for the betterment of students. The link for those list of colleges is given below.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/colleges/list-of-biomedical-engineering-colleges-in-tamil-nadu&ved=2ahUKEwinssKdivDqAhWRxTgGHew0CBcQFjAMegQIAxAB&usg=AOvVaw10pL735bMphH9iiQRsfXum

I will enlist down the Biomedical colleges under these universities -

1. CEG - College of Engineering Guindy, Anna University
2. SSN College of Engineering (SSNCE)
3. Sathyabama Institute of Science and Technology
4. SRM Institute of Science and Technology, Ramapuram

Refer to the site below to get more  detailed information about the same -

https://engineering.careers360.com/colleges/list-of-biomedical-engineering-colleges-in-tamil-nadu

Best wishes. Thank you.