Hello Aspirant, Some of the good colleges of Engineering Design B.tech in Tamil Nadu are

Indian Institute of Technology (IIT) Madras

Vellore Institute of Technology, Vellore

Hindustan Institute of Technology and Science

P.S.G College of technology, Coimbatore

Amrita Vishwa Vidyapeetham, Coimbatore

SRM Engineering College, Kanchipuram

Bharat University, Chennai

Easwari Engineering College, Chennai