Hi Adam,
l'm from Melbourne so can't help with a specific spot in NSW; however, if l were looking for a dark place anywhere I would use the Lightpollutionmap website and simply enter Sydney as the location. You can zoom down to street level if you like and if you use the World Atlas 2015 overlay in the top right dialogue box it give all of the site data: skybrightness, Bortle class, etc..
If you also open a Google Maps map alongside the lightpollution map you can then search for caravan parks, camping grounds, motels etc...
I'm on my phone otherwise I'd link the above as an example.
Good luck in your quest.
Best
JA
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