Hello Ravi,

Here I am naming a few colleges that offer Sanitary courses in Tamil Nadu-

1. WASH Institute, Kodaikanal

2. The Gandhigram Rural Institute-Deemed to be University

3. MMM College of Allied Health Sciences

4. Grace Community College, Nagercoil

You can check about these colleges in detail by following the given link-

https://www.careers360.com/colleges/water-sanitation-and-hygiene-institute-kodaikanal/amp

https://www.careers360.com/university/gandhigram-rural-institute-dindigul/pg-diploma-in-sanitary-inspectors-course

All the best! :)