For Australia there are bugger all smart switches zigbee, z-wave or wifi available that have been approved for use here.
Negotiations are currently underway for Sonoff T1 switches to be approved for use in Au.
Hopefully that will not be too far away. Sonoff wifi switches can be flashed with a number of different firmwares including one for use with Smarthings. There are new rectangle US/Au switches that can be flashed with the 4Ch firmware and used with smartthings. https://www.itead.cc/sonoff-t1-us.html