But Sculthorpe said: "It was always my intention to retire this season.
"I had made up my mind long before Wembley and I am now ready and looking forward to the next challenge."
Sculthorpe joined Saints from Warrington for £370,000 in 1997 and went on to make 261 appearances for the club.
He won Super League honours in 1999, 2000, 2002 and 2006, the World Club Challenge in 2001 and 2007 and was part of the Saints squad that won the Challenge Cup in 2001, 2004, 2006, 2007 and 2008.
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