Eriksen was nominated as CEO of the Norwegian state-owned gambling monopoly in April of last year. He then assumed the role in September.
However, Eriksen will now exit the business to become CEO of Bane Nor, the government agency responsible for the Norwegian railway network.
Eriksen will remain with Norsk Tipping until 1 October. The monopoly has already launched a search to appoint a replacement.
“It is with a heavy heart that I have made this decision and the plan was clearly to stay in Norsk Tipping longer,” Eriksen said. “In one year, I have become very happy with both the social mission Norsk Tipping has and also our employees.
“In the same way as Norsk Tipping, Bane Nor has an important social mission. Overseeing a strong and future-oriented infrastructure on Norwegian railways is exciting and something I have chosen to accept.”
Sylvia Brustad, who was recently elected as the new chairman of Norsk Tipping, said that she regretted the news.
“It is sad for both the board and the employees that Thor Gjermund is leaving,” Brustad said. “He has done a very good job in the time he has led the company, and we would very much like to see him stay with us longer.
“We wish him the best of luck in his new job.”
Stricter loss limits
News of Eriksen’s departure comes after the operator this month put in place additional loss limits for younger players.
As of 1 June, players under the age of 20 placing bets on Norsk Tipping’s platform are subject to a loss limit. Players are now permitted a maximum loss of NOK2,000 (£147/€170/$185) per month.
Norsk Tipping already had in place a NOK20,000 per month mandatory loss limit on all users across all games. The operator said the lower for younger players was due to this group’s increased risk of harm.
Loss limits across Norsk Tipping’s sites traditionally differed It previously set certain limits for different verticals and games.