Police said the couple had been snowboarding in back country areas, an hour's walk north-west of Thredbo, about 12pm on Tuesday when the incident happened.

NSW police said the man had been scaling a ridge in snow shoes in order to snowboard back down, when a snow pack slipped, burying him.

His wife contacted triple zero for help, before helping rescue her husband and taking him to safe ground.

The pair were found following a search of the area by police and fire and rescue crews.

They were taken by snow vehicles to the Thredbo Medical Centre, where the man received treatment for a broken ankle.

Monaro police district commander Superintendent Paul Condon said the incident was a reminder for skiers and snowboarders to be vigilant.

"We've seen great snow falls over the past week, which means the snow is not hard-packed and there is an increased risk of avalanche," Superintendent Condon said.

"Even the most capable skiers and snowboarders can get caught out, so please be mindful of changing conditions.

"Plan trips according to your capabilities, notify others where you are going, have a communication plan in place in case of emergency and make sure you have plenty of appropriate clothing and equipment."