Returning to the Giants upon being drafted, Sexsmith earned an invite to Team Canada's national junior selection camp for the 2008 World Junior Championships. Although he was not selected, Sexsmith went on to lead the WHL in goals-against-average (1.89) for a second straight season, as well as in shutouts, with 9. He was named to the WHL's Second All-Star Team, however the Giants were eliminated in the second round by the eventual 2008 Memorial Cup champions, the Spokane Chiefs.