You can own the single and semi-auto versions but still require either an A,B or H firearm license(QLD).
Here the wiki extract:
Airsoft guns are illegal to own or possess without appropriate license or permit in most states of Australia under state and federal law. Each Australian state has slightly different regulations on airsoft replicas. The regulations of some states are as follows:
* New South Wales: All replica or imitation firearms are classified as prohibited firearms and it is illegal for an individual to own or possess one in NSW without the authority of a permit, and permits for prohibited firearms are restricted to people and/or organisations who have a specific purpose, for example Theatrical Armourers. NSW Police Ballistics Unit have classified the Airsoft range as prohibited firearms due to their similar appearance to actual firearms.
* Queensland: Airsoft replicas that have automatic firing and/or similar appearance to prohibited automatic military style assault weapons or machine guns are prohibited to own or posses. Other single shot and semiauto airsoft replicas are classed under License Categories A, B or H.
* South Australia: Airsoft firearms that have a velocity 1 metre from the muzzle of under 180 foot per second are not firearms in South Australia hence not restricted. Airsoft firearms above 180 foot per second 1m from the muzzle are firearms and depending on calibre for long arms will be either an A or B class firearm. Hand guns are H Class.
* Victoria: Airsoft articles are not permitted in Victoria under the Victorian Legislation and Victoria Police will not issue any authorisation for their importation.
Currently single shot spring powered airsoft guns commonly referred to as sniper rifles (that do not replicate automatic weapons) and gas powered hand guns (without automatic function) may be (technically) imported into some Australian states, such as Queensland. To own, possess or import these devices one requires appropriate license/permission from the weapons licensing branch of each state, and to gain such license/permission, one requires a "genuine reason" among other things. Airsoft is not considered a genuine reason because a) there is no such sport and b)no range will permit the use of airsoft guns anyway. So practically there is no way to own, import, possess or use an airsoft gun in Australia.
Airsoft in Australia though practically non existent is being represented by Airsoft Australia, which is attempting to lift or alter the restrictions and bring the sport down under.
Rhys