Anyone who removes sand from the island's beaches could be fined as much as $3,550.
The unnamed man was apprehended at Cagliari Elmas Airport on September 1 after he was found in possession of a bottle containing 4.4 pounds of sand.
A spokesman for the island's Forest Rangers told CNN: "The bottle was confiscated and is in now in our operating room where we hold these confiscated items. At the end of the year we usually have many bottles of sand accumulated."
In 2017, a regional law was introduced that made it illegal to take sand from Sardinia's beaches.
Fines range between €500 and €3,000 ($600-$3,550), depending on the quantity taken and where it was removed from, according to the spokesman.
The regulations were introduced, he said, because the incidents were becoming more frequent and increasingly problematic.sonos sonos One (Gen 2) - Voice Controlled Smart Speaker with Amazon Alexa Built-in - Black read more
Beaches with "incredible" colored, pink or very white sand are especially targeted, the spokesman added.
"Last year we found a website that was selling our sand as souvenirs. It's become a very known phenomenon here in Europe," he said.
Controls have become "much more rigorous" over the past three years, he said, adding: "The sanctions are much more serious -- we work with the police and they alert us."
Members of the public also contact the authorities if they see tourists plundering the sand.
Last year, police seized 88 pounds of sand from a French couple visiting the island. And a British resident was fined more than $1,000 in 2018, when authorities discovered sand taken from a beach near the northern city of Olbia.
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