Jorge Ortiz scored a brace while Ivan Gonzalez added one in the dying minutes to complete a dominant result.
If Goa are fourth with 15 points, Jamshedpur are fifth with 13. In fact, three points separate teams in third and seventh place, which makes a win ever so important.
The Red and Golds climbed a spot to ninth, with seven points from nine games. FC Goa, on the other hand, remain third with 15 points from 10 games.
The victory also helped FC Goa break their two-match losing streak and get back to winning ways.
Being ambitious teams, they would like to start the process of moving up when they face each other at Tilak Maidan in Vasco on Wednesday.
FC Goa would look to bounce back from the defeat at the hands of Chennaiyin FC, and since they are eight points adrift of table toppers Mumbai City, they can't afford any more slip-ups
Chennaiyin FC finally managed to register a win after five games with a 2-1 victory over FC Goa in a pulsating Indian Super League match.
Chennaiyin are currently in eighth place with five points after five outings, while FC Goa occupy the sixth spot with six points from as many games.
As for Mohun Bagan, a win means that they will be tied on points with Mumbai City FC, who are the leaders with 13 points.
The Goa players are gradually coming to terms with what their new coach Juan Ferrando wants from them, as has been witnessed by their attacking brand of football, which has produced seven goals.
Coming on the back of a win, Ferrando feels their match against Odisha FC will be an important one as one moves into a busy Christmas period.
This game between Kerala Blasters and FC Goa was billed as a contest between two teams who like playing an attractive-expansive style of football.
Kerala Blasters and FC Goa came into the season on the back of huge expectations but have failed to register a victory after three rounds.
With just two points each, both teams have failed to live up to the pre-season hype and are struggling to get results while staying true to their philosophy of possession based football
The Gaurs are also on a six-match unbeaten run against Kerala and will aim to continue that at the home venue Fatorda Stadium.