Last year's champion Shahjalal and runner-up Jibon Boli did not participate in this year's competition
He scored 8.28 points and 7.96 points in the 29 (plus) age category.
“I have come here to represent my country. I still cannot believe that I won the gold medal. I cannot express my feelings in words,” said Dipu.
Earlier in the day, Humaira Akhter Antara won a bronze medal in the women's individual kata event of karate.