Many colleges in Tamilnadu offer B.E. or B.Tech in Agricultural Engineering. Among them, some top colleges for this course are- Hindusthan College of Engineering and Technology, Coimbatore; Karunya Institute of Technology and Sciences, Coimbatore; Bannari Amman Institute of Technology, Erode; SNS College of Technology, Coimbatore; Kalasalingam Academy of Research and Education, Virudhunagar and many more.
You can check the list of all colleges offering the same-
http://engineering.careers360.com/colleges/list-of-be-btech-in-agricultural-engineering-colleges-in-tamil-nadu