The driver of a Lamborghini which fatally struck a teenage girl outside a Chinese restaurant in suburban Adelaide last month intends to plead not guilty to the charges against him, his lawyer says.

Key points: Alexander Campbell was charged over the death of teenager Sophia Naismith

Alexander Campbell was charged over the death of teenager Sophia Naismith Mr Campbell's lawyer says his client was driving the Lamborghini Huracan when it hit her

Mr Campbell's lawyer says his client was driving the Lamborghini Huracan when it hit her But he says his client will plead not guilty, describing it as a "terrible accident"

Alexander Campbell, 37, was charged over the death of 15-year-old Sophia Naismith, who was hit along with her friend Jordyn Callea in front of the House of Tien restaurant on Morphett Road, Glengowrie, on June 22.

Ms Naismith's death resulted in an outpouring of grief, and her family and friends packed the Adelaide Magistrates Court where Mr Campbell made a brief first appearance.

Alexander Campbell outside court for his first appearance. ( ABC News )

He has admitted to driving the sports car, a Lamborghini Huracan, but his lawyer Craig Caldicott said he intended to plead not guilty to causing death by dangerous driving and causing injury by dangerous driving.

"He's saying that he is not guilty of the charges," Mr Caldicott said outside court.

"It's been extremely difficult for him.

"He's had his life turned upside down."

Mr Caldicott said his client was "extremely sorry and remorseful for what has happened".

"Mr Campbell obviously was driving the Lamborghini," he said.

"There's no suggestion of alcohol, there's no suggestion of drugs, there's no suggestion of anything other than the fact there was an accident.

"It is a terrible accident. Mr Campbell is a person who's never been in trouble with the authorities and suddenly having all this happen to him. It's a terrible situation."

The Lamborghini Huracan that hit Sophia Naismith. ( Carsales )

Mr Campbell will face court again next year.

Earlier this month, about 2,000 people gathered at Adelaide's netball stadium for a funeral and public celebration of Ms Naismith's life.

Ms Naismith was a state volleyballer, gymnast and soccer player and a popular student at Brighton Secondary School.

Many of her friends who attended the memorial dressed in team gear to recognise her love of sport.