So diffuse is the problem that the German Embassy in Rome recently told German tourists not to steal Sardinian sand.
"Sardinia has some of the most beautiful beaches in Italy, but taking sand, pebbles and shells constitutes a serious environmental problem.
"It is forbidden by law. You can be fined from €500 to €3000. Leave the sand where it should be," the embassy told its citizens on Facebook.
WWF, the environmental organisation, has launched a campaign against the practice under the slogan "Beach thieves – taking sand is theft".
Customs officials at Sardinia's international airports, including Cagliari and Alghero, regularly check tourists' luggage for consignments of sand.
It is the variety of sand found in Sardinia that appears to be particularly tempting to tourists, with some beaches boasting silky white sand reminiscent of the South Pacific.
In the north-east, the beaches of the Maddalena archipelago are particularly stunning, with the island of Budelli famous for having sand of a distinctive pink hue.