Be open to atypical opportunities.
Not every overseas opportunity comes wrapped in a tidy bow. If you want to merge working with travelling, be open to all kinds of options.
Think about a short term assignment based overseas with your current employer. This could be job swapping, extra support on a specific project or a temporary transfer.
Contests by travel insurance companies, such as www.worldnomads.com/competitions
Volunteer holidays such as at this reserve in Costa Rica www.cloudbridge.org/volunteering
For accountants, check out www.afid.org.uk/mobile/topopps