The body of Hannah Cornelius, 21, a student at Stellenbosch University, was found at 8.30am on Saturday in Knorhoek Road in Stellenbosch.
A male companion who had been with the girl at the time of the hijacking told police he had been forced out of the car.
He was found by police and transported to hospital with head injuries.
The two suspects were arrested at 11am on Saturday after a search by police and were found allegedly found in possession of Hannah’s blue Golf near Dwars-in-die-weg-plaas in Devonvallei, Stellenbosch.
Police have yet to reveal what the cause of Hannah’s death was.
The Humanities Degree student lived in Scarborough.
Police spokesperson Sergeant Noloyiso Rwexana confirmed the arrest of two men.
The men are expected to face charges of hijacking, murder and attempted murder.
Hannah’s distraught uncle Andries Cornelius released a statement saying they wished for the family’s privacy to be respected: “At the time of her death, she was 21 years old.
“The amount of support the family has been receiving is testimony to what an amazing, loving and beautiful person our Hannah was.
“The family has requested that their privacy be respected in this very difficult time.”