Want to hang out on Flakfortet?

No, that’s not the sound Scandinavians make when they sneeze. It’s a private island off the coast of Copenhagen that’s on the market for 56 million Danish kroner, or $8.33 million.

Right now, the former military base is all tricked out as a day-trippers’ and holiday-makers’ destination — one primed to turn a profit for future owners — rather than a place to live, but that could change. Located in the Øresund, the body of water with Denmark to the west and Sweden to the east, Flakfortet spans 330,592 square feet, which is about six football fields.

Its large main building features short-term rental apartments, plus a restaurant-size kitchen and big halls for parties, conferences and corporate team-building retreats. There’s also room for 50 overnight guests in six newly renovated rooms formerly used as army barracks.

There’s also an activity center, a 200-boat yacht harbor and a shop selling beer, soda, ice cream and souvenirs. An 800-meter (half-mile) pier surrounds the whole thing.

Between 1910 and 1914, the man-made island was constructed as a military outpost; a fortress housed 550 soldiers, and cannon-filled towers kept a watchful eye on any seaborne enemies.

Cavort in kilometer (0.6 mile)-long underground tunnels, which once connected the ammunition storage area with the living quarters and other parts of the encampment. (The subterranean passageways are now just an added bonus. In theory, they could perhaps serve as a way for celebrity guests to creep around unnoticed.)

“The island has become a popular place for recreation,” broker Claus Borg, who has the listing, tells The Post. “You can participate in treasure hunts in the tunnels. You can swim in the ocean. You can play minigolf, or just relax and enjoy the magnificent view to Copenhagen on the one side and Sweden to the other.”

After World War I, the Danish navy took over operations; in World War II, Germans occupied Flakfortet. It stopped serving any military purpose in 1968, and for seven years after, there was no oversight.

“During these unprotected years almost everything inside the fortress was broken or stolen,” the listing says.

Then, in 1975, the ministry of defense rented the island to the Danish Sailing Association, which made some repairs and also opened it up to visitors. In 2001, Swedish real estate company Malmökranen AB bought Flakfortet and gave it an overhaul — and now, they’re ready to give it up for the right price.

Sure, there’s that $8.33 million price tag, but Borg estimates that annual revenue, including fees from ferry riders, will total 15 million kroner, or $2.23 million.

That’s because about 20,000 people visit via ferry from Copenhagen’s Nyhavn port every year. When you include the number of folks who pass through on private yachts, that number jumps to 60,000. Busy times are May through September, and then again around Christmas.

Is it worth it?