Randie Leonard George Hill, 29, was arrested Saturday afternoon without incident.
Hill is facing charges of arson endangering human life, possession of incendiary material and six counts of breach of recognizance.
The blaze happened on the early morning of May 28. The officer awoke inside his trailer after the fire alarm went off, police said.
The fire is believed to have started when someone broke into the fenced compound around the RCMP headquarters and possibly set a dry heap of grass and paper alight, sparking flames that spread to the officers trailer.
The officer, whos nearly finished his two-year-term in Shamattawa was treated at the local nursing station for minor smoke inhalation.
The suspected arson ignited anger on the reserve, and caused its chief to issue a statement indicating they would do all it could to help catch the person responsible, including share rumours passed around the community.Hill is slated to appear in court in Thompson on Tuesday. Shamattawa, a remote community of about 1,200, is located 750 kilometres northeast of Winnipeg.