Some rental car providers also permit taking your rental car to Sicily, mainland Italy, Corsica, or even mainland France or Spain. Be sure to search for your desired pick-up and drop-off locations f to find out the options available to you! Remember that these types of one-way rentals are usually significantly more expensive than those within the island.
Also, keep in mind that you will normally have to buy a separate ferry ticket for your rental car. Most ferry companies permit taking a vehicle with you, but you should look this up in advance. The ferry services are much more frequent during the summer months, but then they also tend to sell out more quickly, so it's wise to book tickets in advance.
Although part of France, Corsica is actually the closest territory to Sardinia. If your rental car provider permits island-jumping, the easiest way to reach Corsica is to drive to the northernmost town of Santa Teresa Gallura (about an hour's drive from
Olbia). A ferry trip to Bonifacio, the southernmost settlement on Corsica, takes less than one hour.
One of the main ferry hubs in Sardinia is the town of Porto Torres. Located in the northwestern part of the island near Sassari and Alghero, it has ferries going to such varied destinations as Corsica, Genoa, Barcelona, and Marseille. On the eastern part of the island, Olbia Port has connections with Rome and Livorno.
The only connection with the island of Sicily is a ferry that goes from Cagliari Port in the southern part of the island. The trip takes about 11-12 hours. Cagliari also has ferry connections with Naples in Southern Mainland Italy.