The team defeated New Zealand 12-7 in the main final.
Samoa created an upset in the semifinals after defeating the host nation, South Africa 10-7 with a winning penalty kick from Faafoi Falaniko in the extra time.
This is after they defeated Argentina 21-10 in the quarterfinals yesterday.
The Brian Lima coached side kick started their campaign with 21-10 win against Uruguay at the tournament.
This was before they defeated Japan 45-0 in their second pool game and lost to Ireland 14-21 in their final pool game.