It’s no superstorm — but another kind of sandy is wreaking havoc on Coney Island’s boardwalk.

Activists and business owners say the boardwalk has been overrun with unprecedented piles of sand this season — so much so that it’s hard to tell the fabled walkway from Coney Island’s equally famous beach.

It’s been so bad, sources said, that the city has assigned dozens of additional workers to shovel sand off the 2 1/2-mile Riegelmann Boardwalk and back onto the beach.

“This is horrible,” said Maureen Masterson, 32, of Bensonhurst, Brooklyn, as she swerved around piles of sand Wednesday while trying to roll her 2-year-old daughter Kate in her stroller. “It’s like Sandy never left.”

Preservationists attribute the mess to the city’s controversial move to replace much of the boardwalk’s wooden planks and base with cement.

“With cement, there’s nowhere for the sand to fall through,” said Todd Dobrin, president of the grassroots group Friends of the Boardwalk.

“There’s no doubt the new surfaces are causing the sand to pile up like never before.”

Along the beach, dust-control trucks were wetting down sand, trying to prevent it from blowing onto the boardwalk and pummeling passers-by — including other stroller moms and patrons trying to enjoy a Nathan’s hot dog.

Dennis Vourderis, co-owner of Deno’s Wonder Wheel Park, said sand is even piling up in the amusement district — which still maintains a wooden boardwalk.

He blames the extra sand on Hurricane Sandy pushing it closer to the boardwalk and making it “finer” so it blows more freely.

“This is the worst we’ve seen it,” said Vourderis, who recently put up netting outside Deno’s to block sand from damaging his rides’ motor systems. “We have to shovel all week just to be ready for the weekend.”

Parks Department spokeswoman Meghan Lalor said sand will pile up on the boardwalk no matter what material the city uses.

“Sand will accumulate on a boardwalk without regard to the decking or the foundation,” she said.

The sandy pile-up comes after the preservation group Coney-Brighton Boardwalk Alliance sued the city, claiming a plan to replace part of the wooden boardwalk with concrete and plastic needs an environmental review.

A judge ruled in December the city could move ahead with the plan without the review, irking neighbors who say it’s now part of the problem.

“This is what you get when the city decides to make changes without doing a proper environmental review,” Dobrin said.