The Facebook page has attracted nearly 20,000 likes, and nearly 10,000 people have signed a petition calling for tougher penalties for visitors caught with smuggled consignments of sand.
"Even sand or a simple stone is part of Sardinia's natural heritage and should be left where it is found," one supporter wrote. "I hope that people who are caught will receive the punishment they deserve."
While the amount of sand, pebbles and shells being stolen is unlikely to put a dent in Sardinia's hundreds of idyllic beaches, campaigners say it is a matter of principle.
They have called for information panels to be installed at airports and ports in an attempt to educate tourists about the importance of leaving beaches, bays and coves as they find them.
"We've beefed up efforts to prevent the theft of sand from our beaches," Donatella Spano, a councillor responsible for environmental protection, told La Repubblica newspaper.
Sardinia, renowned for mega-yachts and millionaires' villas, is blessed with hundreds of miles of idyllic beaches, many of them boasting sugary white sand reminiscent of the South Pacific or the Caribbean.
The beaches of the Maddalena archipelago are particularly stunning, with one island famous for sand of a distinctive pink hue.
Some of the sand was taken from beaches along the Costa Smeralda or Emerald Coast, where Berlusconi, the former Prime Minister, has a villa - the setting of his infamous parties.