In the eight-men final, Sajan, clocked 1:59.05 seconds to finish five seconds more than the gold medal winner Chad Le Clos of South Africa.
In the process, Le Clos achieved a CWG record by clocking a timing of 1:54:00 seconds at the Optus Aquatic Centre here.
Australia's David Morgan bagged the silver after finishing at 1:56:36 while Scotland's Duncan Scott (1:56:60) had to settle for the bronze.
Earlier, Sajan narrowly qualified for the finals after finding himself in the reserve category after the Heats. He recorded a timing of 1:58.87 seconds to better his own national record of 1:59.10, and finish at the fifth spot in Heat 2 of the qualification round.
Meanwhile, another Indian swimmer Srihari Nataraj entered the semi-finals of the men's 50 metre backstroke event earlier on Saturday.
Srihari recorded a time of 26.47 seconds to qualify in the ninth spot among 16 qualifiers in his category. The Indian finished third in Heat 1 behind Australia's Mitch Larkin and Xavier Castelli of Wales.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
