The most amount of mellow sport climbing is in Hillwood, near Launceston. There's the odd route about in Freycinet but not really worth the effort. The Organ Pipes above Hobart now host a bunch of sport routes that make for some fun climbing but not really a sport crag per se. Check out thesarvo.com for the info, most won't be in a printed guide as they're relatively new. The Paradiso (not far from Fortesque) has a bunch of good sport climbing too and makes for an awesome day out. If you can borrow a few cams from a friendly local the Moai makes for an awesome day out too.