The man, 55, is accused of using his position as a Canada Border Services Agency employee to extort a woman facing deportation. The accusations date to 2003, but the complaint was made to Halifax police in November 2014.
Halifax Regional Police Cst. Dianne Woodworth said police started investigating then.
"Based on the investigation, it's alleged the CBSA employee used his position of authority as an immigration officer over a then 26-year-old woman, who was scheduled to be deported in June 2003, by extorting and sexually assaulting her on more than one occasion in Dartmouth that same year," she said in a news release.
Police went to Montreal on April 1 to arrest the Quebec man. He was brought back to Halifax and appeared in Dartmouth provincial court on Monday.
The immigration officer was released and is due back in court on May 9.