The event is due to take place at the Nevis Range, Fort William on 22-23 May – but organisers have said a closed-doors event just won’t be the same.
Mike Jardine, from Rare Management, said: “Whilst we all desperately want a return to the usual Fort William crowds and the amazing atmosphere they create, despite the progress of vaccination and planned easing of lockdown restrictions, the reality is the World Cup on 22 and 23 May will not be possible with spectators in attendance.
“Spectators have been at the heart of every World Cup and have made it the much admired classic it has become.
“A closed event will never be the same – but as with every other sport, if the competition is to take place it must be under very different conditions."
All existing ticket holders will be contacted organisers said.