Vallam Sundar is an Indian professor of Coastal Engineering at the Department of Ocean Engineering of Indian Institute of Technology Madras, Chennai, India. Vallam Sundar studied Civil engineering at the College of Engineering, Guindy, where he graduated in 1975. He completed his post-graduation in Hydaulics from IIT Madras in 1977 and received his doctorate in 1982 from the same institute.

Sundar started working at Anna University as Associate Lecturer. In 1981 he became a Scientific Officer at the Ocean Engineering Centre at IIT Madras and worked till 1987. In 1987 he became Assistant Professor of Coastal, Port and Harbour Engineering in the Ocean Engineering Centre at IIT Madras. During 2003–06, he served as the Head of Department of Ocean Engineering (IITM).