A man has died and a 14-year-old boy has been critically injured after a tandem skydiving accident at Goulburn Airport in southern New South Wales.

The pair was undertaking a tandem skydive from 10,000 to 12,000 feet just before 2:00pm (AEDT) on Saturday, when the pair crashed into the ground.

The instructor died at the scene.

Adrenaline Skydiving chief instructor Yaakov Bokay said his colleague had eight years experience at the business.

"He was a very awesome person, a very good friend, always giving, always helping — if you needed anything or had any problems, you'd just ask him, he was always there for you," he said.

"He was a very experienced skydiver, many hours."

Mr Bokay said the pair was caught by turbulence in the wind.

"Everything was normal, the jump was normal, the canopy opened pretty good and normal, but just before the landing [there] was wind and smashed both of them to the ground," he said.

Mr Bokay said the wind was unexpected and was not very high in Goulburn.

"We have a limit of 25 knots, the jump was between 5-10 knots, the wind was only about 10 or 12 knots — it was unexpected wind across the canopy" he said.

NSW Police said the teenager was flown to the Royal Randwick Hospital in a critical condition.

Investigations into the incident are continuing.