The incident happened between Toulouse’s Norman and Warrington Wolves’ Oliver Holmes during the two teams’ match last Thursday.
Norman, 31, who spent 11 years playing in the Australian National Rugby League before joining Toulouse in April, has pleaded not guilty to the offence.
But the president of the court, judge Sarah Wright, and the two members of the team, both former players, were “fully convinced” that the act was intentional.
Holmes complained about the incident during the game and also provided a statement to the court.
“Footage of the incident shows deliberate movement of Corey Norman’s left arm and hand over Oliver Holmes’ top and onto his buttocks,” the ruling said.
“At no point does the footage show a grab of the shorts to push Oliver Holmes down, as described by Corey Norman.”
Norman first announced his retirement from rugby league at the end of last year before returning to the sport with Toulouse on a running contract until the end of the current season.
The French side are currently bottom of the Super League with four games remaining this season.
