Early career Sangma received early lessons of football at the Assam Police Reserve in
Dergaon. In
1974–75, he scored the goal that knocked out the defending champions
Kerala and took Assam to the quarter-final. He represented the state team in seven seasons from 1973 to 1980 in Santosh Trophy. In 1981, Sangma guided Assam Police AC to win the
Bordoloi Trophy, where he scored the winning goal in final against the mighty
Dempo SC of Goa. He helped the team to lift several trophies including coveted Bordoloi Trophy,
Independence Day Cup and
ATPA Shield. ==International career==