Nope. To the best of my knowledge, this one was never released as an audiobook.
Personally, I don't get the draw of audiobooks. 99% of them are abridged versions of the originals. I would hate that but they seem to sell well so obviously many don't agree with me.
Still, if you have absolutely no time to read and have a long commute or something, I guess it's better than nothing.
If you were into audiobooks though, this would've been a good one. I loved the story and if they could've gotten Andrew Robinson to actually read it, wow! I might've picked that one up just to hear the voice of Garak come alive again.
- Byron
P.S.
The Complete Starfleet Library is an excellent resource for this type of thing and every true TrekLit fan should have it bookmarked. There's even an option to filter by type of book, including audiobooks. The information seems to be very accurate.
http://www.well.com/~sjroby/lcars/