Hello Muthupandi,

These are the Medical Institutes where you could find Operation Theatre Technician course at Tamil Nadu.

Karpaga Vinayaga Institute of Medical Sciences, Chennai. #4, Dr. Ambedkar Road , Chennai (Chennai Dist.) 

Christian Medical College, Vellore. Ida Scudder Road , Vellore (Vellore Dist.) - 632004. Tamil Nadu.

Dr. Jeyasekharan Hospital and Nursing Home, Nagercoil. K.P.Road, Nagercoil

BEST WISHES!