Yes, SXSW accepts Out Of Town (OOT) Volunteers.
OOT Volunteers should secure housing in the Austin area for the event. Volunteers registering as OOT will be required to provide a local Austin area address before they will be able to select their volunteer schedule. As an OOT Volunteer, the SXSW Volunteer Fair, in-person training(s), and any venue walk-throughs are optional.
Volunteers are responsible for their own travel and lodging arrangements, and must arrive in Austin with enough time to check in at Volunteer Central at the Austin Convention Center and arrive to their first shift on time.
More information for OOT Volunteers can be found here.