Hans,
For private importation of 20 mW Max Output laser pointer in Queensland, the Customs and Border Protection guidelines are set out at
http://www.customs.gov.au/webdata/re...PersonTest.pdf The "Test" you need to satisfy if Customs is to grant permission is the Specified Persons Test. It's all in the above guidelines.
The application to Import is made using Form B710 at
http://www.customs.gov.au/webdata/re...710AUG2009.pdf
And thanks to Geoff for the link to QPOL information sheet.