Three people, including two children, have been taken to hospital and another 27 assessed by paramedics after a tractor-towed wagon rolled on a property near Gerringong.
Emergency services were called to the accident, at a Rose Valley Road address, about 11.15am on Tuesday.
It is understood a tractor was towing a wagon, with 31 people on board, when it overturned.
No one was seriously injured, a NSW Ambulance spokeswoman said.
Paramedics assessed 27 people on the scene, all of whom were walking and displayed no obvious injuries.
Three people - understood to be a man and two children - were taken to Wollongong Hospital with minor injuries to be assessed further.
The ages of those hospitalised have not been confirmed, at this stage.
It is understood the people involved are Japanese tourists.
A bus has been arranged to transport the remainder of the group from the scene.
The spokeswoman said paramedics were called to the scene at 11.18am, following reports a wagon carrying tourists had rolled.
A number of ambulances responded to the scene.
NSW Rural Fire Service crews worked to assess the vehicles involved for stability and assist paramedics.
Police are investigating the incident.
A NSW Police spokeswoman said officers arrived at the property just after noon after a trailer carrying 31 people rolled.
"The trailer was being towed by a tractor on private property," the spokeswoman said.
"Three people, including two children, were taken to hospital with non-life threatening injuries."