It happened in the Ligoneil Road on Friday evening.
The victim, aged in her 30s, got into the silver Mercedes C220 car which she had parked shortly before 6pm and found there was a man sitting in the back.
He told her to drive up the road country-bound before forcing her out and driving off.
The woman was left shocked but not hurt.
Police said the car was later recovered in Dunmurry. Anyone who saw the man, who was wearing a dark jacket, white t-shirt and dark grey hat - or the car - is asked to come forward.