Sardinia is the ideal place for windsurfing due to its geographical formation and exposure to wind and waves.

The wave paradises in the region of Oristano are: Capo Mannu (near Putzu Idu) and Funtana Meiga.

Chia is also the most famous place for competitions because it is here that the well-known Chia Classic Invitational competition takes place, the major Italian competition.
Go to La Spiagga del Giudeo at Easter at you won't regret it.

The most committed prefer the Oristano area because, when a strong Mistral blows in Capo Mannu, you can ride the biggest waves in the Mediterranean (3-5 metres) with a perfectly oblique wind.
Or, for a site better equipped logistically, you can go further south to Funtana Meiga in Sinis