After hammering Bhutan 18-0 in the opener, India recorded their second straight victory to march into the last-four stage of the event.
The rout started in the first half itself as India pumped in four goals to push their opponents to the back-foot.
They never allowed Sri Lanka to settle in the match after that and added three more goals to their tally in the second half.
Sasmita Mallick was once again the star as she scored a superb hat-trick (18th, 30th and 45th minute), while Pinky bagged a fine brace (51st and 60th minute).
Bala Devi (second minute) and Tababi Devi (49th minute) too got their name on the scoresheet by netting a goal each.
India will take on hosts Bangladesh in their third and final group league encounter on December 17.