Sunder was born in India and grew up in the capital city of New Delhi. He is a graduate of the Indian Institute of Technology and received his M.S. in Mechanical Engineering from the Massachusetts Institute of Technology and worked with Atomic Energy of Canada.
He became a pastor in 1980, retiring in 2016. Sunder and his wife, Shyamala, have been married since 1971. They have two grown children, Vijay and Sheila, and six grandchildren.