[1][2] Kristinn played 17 seasons in the Icelandic top-tier Úrvalsdeild karla.
His best season as a player came in 1994-1995 when he finished as the league's third leading scorer,[3] averaging 27.1 points per game for Þór Akureyri, and was selected to the Úrvalsdeild Domestic All-First Team.
[4] He was selected to the 1995 Icelandic All-Star game where he scored 51 points.
[5] On 2 May 2001, Kristinn received a one-month suspension from the National Olympic and Sports Association of Iceland after he tested positive for efedrin.
[6] Between 1992 and 1994, Kristinn played 13 games for the Icelandic national basketball team.