Career
Wanvig was originally drafted 89th overall by the Boston Bruins in the 1999 National Hockey League Entry Draft, but he re-entered the draft and was selected 36th overall by the Minnesota Wild in the 2001 National Hockey League Entry Draft. In July 2006, he was signed by the Atlanta Thrashers. In February 2007, he was traded to the Tampa Bay Lightning along with Stephen Baby for Andy Delmore and Andre Deveaux.
He came to the Swedish Elitserien to play for Brynäs IF in November 2008.
However in January 2009 Wanvig"s contract with Brynäs IF was terminated with immediate effect. In 2009, Wanvig returned to North America, joining the Portland Pirates of the AHL. In July 2010 he signed a contract with the Augsburger Panther, 2010 finalists of the highest German league, the DEL. During the 2011-2012 season, while contracted to European Commission Vesicular Stomatitis Virus, Wanvig announced his retirement after 16 games when he suffered an injury on December 11, 2011.