His agent, Stan Rosenfield, says Sheen returned to the Warner Bros. set in Burbank, Calif., on Tuesday morning.
The 44-year-old actor voluntarily entered a rehab facility "as a preventative measure" that temporarily halted production of CBS' top-rated sitcom last month.
Sheen still faces legal problems arising from a fight with his wife in Aspen, Colo., in December. He is charged with assault, criminal mischief and menacing, which carries a possible sentence of one to three years in prison.
