You will have to apply to the RCMP. Strongly recommend contacting one of the agencies that will digitize your prints and submit them electronically, it will greatly speed up the process. (Read the info in the pink box very carefully).
http://www.rcmp-grc.gc.ca/cr-cj/fing-empr2-eng.htm
Of course, you will have to find someone to take the prints for you in Italy (what city?). If you can't find any, perhaps you can ask at the Canadian Embassy -
http://www.canadainternational.gc.ca/italy-italie/visas/index.aspx?lang=eng
http://www.canadainternational.gc.ca/italy-italie/consular_services_consulaires/criminal_record_check-verification_casier_judiciaire.aspx?lang=eng