The best idea is to use your own or a hire car to allow maximum freedom. To get to Scottsdale, drive from Launceston via the Tasman Highway 1 hour or the Lilydale Road also one hour. If arriving via Lilydale Road, be sure to turn into King St and not miss the town completely, as this is possible after the re-diversion of the entry to the town.
Redline Coaches serve Scottsdale, there are a couple a day from Launceston and Derby.