The Tour de France stage winner was arrested hours before Sunday's race in Wollongong where the 27-year-old was one of the title favourites.
He had confronted two girls - grabbing one on the arm and pushing the other - after he says the girls repeatedly knocked on his hotel door on Saturday night and ran away.
After the two-time Tour of Flanders champion pleaded guilty on Monday, Sutherland magistrate Hugh Donnelly convicted him and ordered he pay fines of $1000 and $500 for the two common assaults.
The grandson of famed French cyclist Raymond Poulidor was to lead the Dutch team in Sunday's 266.9km race but withdrew within the first 30km.
The next-best Dutchman Bauke Mollema finished 25th.
"He admits he dealt with it inappropriately but still there's an explanation," criminal lawyer Michael Bowe told AAP.
"The damage he suffered was enormous.
"He feels like he's let his whole country down and his whole team."
With the court matter over and his bail conditions no longer in effect, van der Poel was able to retrieve his passport and fly out of the country on Monday evening.
However, Mr Bowe will lodge a sentence appeal on Tuesday morning in the District Court, seeking to set aside the convictions.
Police had alleged the cyclist pushed two girls in the hallway of his Brighton-Le-Sands hotel, with one falling over and the other hitting a wall, suffering a minor graze to her elbow.
Van der Poel's CV includes four cyclocross world championships, stage wins in the Tour de France and Giro d'Italia and several victories in the one-day spring classics.
He wore the yellow jersey for six stages in the 2021 Tour and represented the Netherlands in mountain biking in the Tokyo Olympics.
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