But he insists that Trevor Sinclair or David James should have won it and says:
"I am very happy because it is the fans that voted for me tonight; it is the best thing to happen to me this season.
"In fact it is the best trophy I have had - apart from when my son was born!
"But the best players were David James and Trevor Sinclair and I am very surprised, though it is good for me for next season."
Seb, typically modest about his achievements, is more concerned with the fact that Trevor Sinclair was omitted from the England squad on the day of his presentation, and adds:
"Nobody understands because Trevor played so well in the last three months, and for me it is a big problem for England; Eriksson would have had a lot of options with him because he can play on the right, on the left, or in midfield.
"It is his choice, he is a good manager - but in my opinion it is a big mistake; Trevor is a fantastic player, and equal to Paolo.
"Eriksson has decided for the country but I don't understand because I think he is much better than Butt or Murphy -but I am sure he has a strong mentality and can be ready for next season."
The award is a massive turnaround in the fortunes of Sebastien, who looked set to leave in the summer before following a loan spell from Metz.
But, when Glenn Roeder took over, he signed him for £465,000 and has proven himself to be a bargain.
"If I can prove more every year it is good for me because I have a lot of ambition," he says.
"I want to stay all my life here because I am so happy - I don't want to move next season or in two or three years; it is not possible for me to find anything better than West Ham.
"There is a lot of ambition here to play football and for the new stadium."
David James was named runner up and also attended the award function, which was attended by vice-chairman Martin Cearns and MD Paul Aldridge.
"I would extend my congratulations to Sebastien, and indeed to both David James and Joe Cole for their England call-ups on what has been a proud day for the club following the visit of the Queen and the Duke of Edinburgh."