This was announced in a release issued by the company to the Bombay Stock Exchange on Tuesday.
Sumantran joined the company as executive director (passenger car business and engineering research centre) in November 2001.
"It has been a privilege to have worked with Ratan Tata, and to have been a part of Tata Motors during the turnaround phase of the company's recent performance. The spirit of its people is truly admirable," Sumantran said.
"I will cherish many fond memories of their dedication and cooperation. I leave the company with a lot of goodwill and good feelings. I wish them continued success in their future endeavours," he said.
Ratan Tata, chairman of Tata Motors, was quoted in the release saying, "Dr. Sumantran has been a member of the senior management team at Tata Motors, and has contributed significantly to the company during his association. I wish him all success in his future career."
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