Pisi collected both the Players' Player of the Season award - voted for by the Saints squad - and the Supporters' Player of the Season award, in which he received nearly 20 percent of the total votes cast, four percent more than the next highest player.
Ben Foden and Alex Waller were the other two players to receive their awards for Try of the Season and Young Player of the Season respectively.
Foden's second score in the Aviva Premiership Rugby win over London Wasps on March 24th was the overwhelming winner of the public vote, while Saints supporters recognised Waller's contribution to the cause - the prop being the only player in the Saints squad to have played in all 35 first team games this season - in making their decision.
Both players had already been on stage at the start of the night. Waller joined Calum Clark and Mark Sorenson to collect his club cap for passing the 50-appearance mark this season, while Foden received a pair of exclusive cufflinks for reaching his century of first team appearances, along with Chris Ashton, Lee Dickson and Roger Wilson.
"To get honoured by your peers is massive and a big award," said Pisi. "I'd like to thank the fans as well. Without their support it wouldn't be the same. They're here backing us week in, week out, and to get their recognition is what you want as a player.
"It's been a memorable first season for me at the Saints, and hopefully next season can be even better."
In lifting the award Pisi earned himself the opportunity to fly with The Blades on Friday morning. Pisi, along with Foden, Waller, and auction winner Hannah Ayres, will fly with the former Red Arrows pilots of the Sywell-based aerobatics team to mark the end of the 2011/12 season.
The Samoan is looking forward to the experience, adding: "You never get the chance to do that, so I can't wait!"
The Saints End of Season Awards Dinner was sponsored by Aspers Northampton, with Carlsberg UK, Ewing Associates and Trevor Dighton sponsoring individual awards. Steffans Jewellers donated the prizes.