The Golf Writers' Trophy is awarded to the player, born or resident in Europe, or the team, who have made the 'most outstanding contribution to golf during the preceding 12 months'.
The Great Britain and Ireland Walker Cup team finished second, followed by the European Solheim Cup team, of which Sorenstam was a member. Ernie Els, who resides in Wentworth, Great Britain, finished fourth.
Darren Clarke and British Amateur champion Gary Wolstenholme also received votes.
Sorenstam won six times on the LPGA Tour in 2003, won the money title and played an integral part of the European Solheim Cup team's victory in Sorenstam's home country of Sweden. She completed the career Grand Slam with wins at the LPGA Championship and the Women's British Open.
The Swede became the first woman since Babe Zaharias in the 1945 Los Angeles Open to play on the PGA Tour. Sorenstam teed it up at the Colonial but missed the cut. She played in the Skins Game at the end of the year and finished second to Fred Couples.
'I am deeply honored to be selected by the Association of Golf Writers for this award,' said Sorenstam, who was inducted into the World Golf Hall of Fame this year. 'The 2003 season has been an incredible year for me, from playing at the Bank of America Colonial to achieving the LPGA career grand slam to competing in the Solheim Cup and the Skins Game -- with many other highlights in between.'
Sorenstam is the first woman to win the award since Alison Nicholas in 1997 and the first ever from outside Great Britain and Ireland, aside from the Solheim Cup team in 1992. She joined Spain's Seve Ballesteros, Germany's Bernhard Langer, the 2004 European Ryder Cup captain and Spain's Sergio Garcia as continental Europeans who have won the award as an individual.