Dude, I'm sorry but looking at the camera specs this looks like yet another case of Sony trying to push one of their proprietary protocols rather than using an industry's de facto standard. Unless Sony provides a driver for OS X you are out of luck.
This has been a problem for several years. Some of Sony's digital tape cameras used a proprietary format called MicroDV rather than the standard MiniDV. If you got one of those back then, you could only use a hardware plus software combo that'd been blessed by them.
This is why it's important to do research BEFORE buying a product - not just for Mac users, but for anyone. Especially with Sony. They lock you into their particular system, and you're stuck with it.
Edit: I may not have been entirely correct. It appears that one other vendor - Panasonic - is on board with AVCHD. So it's possible the format isn't as closed as I thought (it's still possible that it is closed. It's an open question).
You might be able to move the files over by dragging them, if you treat the camera like an external hard drive. But it doesn't look like there is support for AVCHD in any software not offered by Sony, at least at present.