Is there a ferry going from Sabaudia Italy, to the lsland of Sardina?
It looks like the closest ferry routes go either out of Fiumicino (near Rome) or Naples.
Like Brad says, the closest one will be just outside of Rome in Civitavecchia, or Fiumicino http://www.cemar.it/dest/ferries_sardinia.htm Last year we took on overnight ferry from Livorno, and for our return trip, caught a lo-cost flight back on Ryan Air to the Ciampino airport. Then took a cab to Fiumicino airport for our flight home.