Sporting Clube de Goa, who led 2-1 at half time, scored through Karpeh (3rd, 7th minutes) and Anthony Wolf (60th) at the Raia ground.
The visitors, who put up improved performance in the second half, scored their goals in through Sankar Oraon (32nd) and Sujay Oraon (70th).
Sporting Clube de Goa, who have not performed well in the ongoing pro-league, looked a better side today as they controlled the proceeding from the start. The home team moved the ball around well with short passes and scored two early goals before the visitors could settle down.
Karpeh again found the net four minutes latter with a rising shot when Anthony Wolfe put a forward pass to him after received the ball from the left from Mauvin Borges.
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Sporting, missed couple of clear chances. First Wolfe's well directed shot was tipped over the bar from inside the box and latter he failed to score from close range.
The mandatory drink break midfway in the first half saw Sporting loose their concentration as the visitors reduced the margin in the 32nd minute.
After the chance of ends, Sporting continued to enjoy better ball possession and increased the lead in the 60th minute from a penalty after Wolfe was brought down by a rival defender and referee Maria Joseph awarded a penalty to Sporting, which the striker converted himself.
United SC retaliated and after missing a few chances pulled another goal back in the 70th minute when Sujay Oraon scored from top of the box with a left footer that found the roof of the net.