Canadian soldiers have joined the search for a bushwalker missing in the New South Wales Snowy Mountains for more than a month.

Prahbdeep Srawn, 25, was last seen on May 13 when he left Charlotte Pass Village on a walk to Mount Kosciuszko.

Mr Srawn's sister, Mandeep, says 11 off-duty Canadian soldiers will set up camp in the mountains for three days as they begin a fortnight's search for their colleague.

"They'll let us know if they need to come back ... [or] just re-think their strategy and go into a different area," she said.

"We've looked into helicopter companies to send them so they don't need to do this whole-day commute."

Mr Srawn was a reservist in the Canadian military.

His family says it would be inhumane to give up their search.

They have offered a $100,000 reward for anyone who finds Mr Srawn, but police have warned against inexperienced hikers attempting the search in the rough mountain terrain.

Extensive land and aerial searches have failed to locate him.

The family says Mr Srawn's mobile service provider found the last signal from his phone was sent from the west face of Mount Townsend.

 

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