A judge has declined to impose another intensive supervision order on a man who was convicted of committing obscene acts on himself at a West Australian primary school but didn't comply with a previous order.

Darren Edward Foster was in January 2012 convicted of committing the acts at Flinders Park Primary School in Albany and handed an 18-month intensive supervision order but failed to attend many of his appointments.

In Perth's District Court on Friday, Judge Gillian Braddock decided not to impose another order and instead fined Foster $1000.

Judge Braddock noted he hadn't reoffended, so the original order had achieved its purpose, but there was still no excuse not to front court.

"You make a lot of excuses," she said.

Foster's defence lawyer said he was at no risk of offending in a similar way given his crime was "particularly odd in nature".

He was captured on CCTV wearing nothing but a sports jacket and sitting on a water fountain in the grounds of the primary school just before midnight on April 13, 2011.

The footage then captured him committing an indecent act with a shovel handle.

"There is no doubt that behaviour is shameful and disgusting," Judge Braddock said.

The school had the water fountain professionally cleaned.

The court heard Foster was using methamphetamine at the time and was HIV positive.