An elderly woman was caught between two cars at the Aldi car park in Kangaroo Flat at about 6.30pm on Wednesday.
The car backing out was driven by a second elderly woman.
The first elderly woman was standing near a stationary car when she became trapped between the two cars.
Senior Constable Steve Bice said the woman was taken to hospital with minor injuries.
He said police were still investigating how the accident happened.
The Country Fire Authority and State Emergency Service attended the scene briefly, but left soon after once the situation was under control.