The incident happened at Yonge Station shortly after 9 p.m.
When emergency crews arrived, they found the victim unconscious and breathing, police said.
He was rushed to the injury center in serious but stable condition.
Sign up for Toronto Emergency Alerts directly on your phone or email
Police initially said the woman was hit by the train, but clarified that she was injured due to the fall.
On Monday, Toronto police released a surveillance image of the suspect in an attempt to identify her.
Police describe the suspect as having blond hair with a medium build. They say he was last seen wearing a gray “Levi’s” shirt, black jacket, black pants, white shoes, pink and gray buckles and holding a gray bag.
It is not clear why the suspect pushed the woman and police say there is no reason to believe the two women knew each other.
The incident prompted TTC to suspend subway service on line 2 between St. Louis stations. George and Broadview. Trains on Line 1 also bypassed Bloor-Yonge Station due to the incident.
Regular service continued on both metro lines shortly after 11 p.m.
This is the second time in five months that someone has been pushed into the lines at Bloor-Yonge subway station. On November 26, police said a suspect pushed a man who fell on the lines as he approached a train.
