To & from Terminal to Terminal and  from Brisbane Airport to your destination:

1. By Train:
The Airtrain (for schedule open:  airtrain.com.au): runs (a) between terminals every 15 minutes during peak hours and cost  AU$5 (free for children 14 & under); (b) to Brisbane CBD; and (c) to Gold Coast.

By Bus:
    The TBus runs between the terminals and the Airport Village shopping precinct;
    Translink buses:

Bus 369 Mitchelton Rail Station to Toombul interchange: (transfer to Line 590 at Toombul)
Bus 590: Upper Mt Gravatt to Boronia Road and Skygate
Bus 590 now extends through to Toombul but still picks up at Skygate.
    Coachtrans Australia (+61 7 3358 9700) offers three services:
(a) to Brisbane City & central business district (door-to-door to accommodations, CBD, Kangaroo Point, Brisbane Transit Center);
(b) to Gold Coast door-to-door from Sanctuary Cove to Coolangatta;
(c) to Brisbane Cruise Terminal, Portside Wharf Hamilton - every 30 minutes. 

In addition there are registered ground transport operators with vehicles for 1 - 29 persons, running every 25-30 mins at Domestic, and every  hour at International terminals. Inquire at the transportation desk on the arrivals levels of the terminals.

Google Plus One