Yes after passing Electronics and Communication Engineering you can do M.Tech. in Robotics Engineering. Here I am giving you information about required eligibility for M tech robotics engineering ..

M.Tech. Robotics Engineering Eligibility
You have to pass B.E. and B.Tech. Electronics and Communication Engineering or Mechanical Engineering from a well recognized university
For admission you have to pass an entrance examination organized by college administration ..

M.Tech. Robotics Engineering Entrance Exam
GATE-Graduate Aptitude Test in Engineering
IISC Entrance Test
National Institute of Technology M.Tech. Artificial Intelligence and Robotics Entrance Exam
SRM Engineering Entrance Examination (SRM EEE)