Yes, but the primary maritime counter terrorist unit of Australia is their CDTs Clearance Diver Teams, which have their own component for CT operations. Read 'Navy Divers by Gregor Salmon' it details this
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What would the SASR do if a Bass Strait oil platform was captured? They could parachute onto the rig – no problem – but chances are they would be spotted and the alarmed enemy might turn the platform into the world’s biggest barbecue. At the very least a maritime counter terrorism force needed to be able to execute beyond-horizon, clandestine infiltrations. This required a degree of dive knowledge and boat skills the SASR simply didn’t have.
Only one group within the Australian Defence Force did: the Navy’s clearancedivers.
Since counterterroris is entirly SASR's gig they provide training, qualification, gear and weaponary to the CDTs"
And MARCOS have done joint training with CDT boys also. That too with AUSCDT4 which based is near SASR in Western Australia. So their primier Maritime CT team as well as diving operations
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Wont share much pics, you can look it up on the net but they have our boy's faces shown