Yes, the relevant Sky dedicated 3D channel is indeed called Sky 3D as VHG says. It broadcasts on Sky Channel 217.
However, (and this is a pretty big however to my mind), the channel is only available to those who subscribe to Sky Entertainment Extra, Sky Movies, Sky Sports and the HD Pack and this little lot is currently £65.75 per month.
The unfairness of it all for those on a budget is that Sky 3D cannot be "bolted-on" as a single channel to any of the other packages for a set fee - you either pay the £65.75 per month or go without.