WFNC president Andrew Murdoch said it was “pretty disappointing” given the current circumstances.
“Local hoons - who knows but pretty senseless,” Murdoch said.
“We only got the blue paint and lines down on Saturday afternoon.”
Murdoch said he was not sure what the cost would be to repair the damage.
The new netball courts were part of a grant provided by the Wentworth Shire Council and will cost around $200,000 when completed.
The next stage of the development will be to erect fencing and lighting around the courts.