There are many places to stay within Mooloolaba or elsewhere on the Sunshine Coast. Below are some individual websites for apartments within the area then this will be followed by some general websites that will give accommodation info along with local area info. Many of these places offer 2+ bedroom apartments so it may be worth getting together with someone you know to share as it may work out cheaper.
In Australia (especially on the Sunshine Coast) it is more common to find apartments with full kitchens, lounge and bedrooms than it is to find a standard hotel room as with elsewhere in the world. This can also make your stay much cheaper and more enjoyable because you can get your breakfast and lunch food from the local supermarkets and eat in the apartment rather than dining out 3 times a day. Most of the links below have apartment style accommodation.
Main Holiday/Regional Websites: