Talk to your department head at your college or university. Most internships are sought and secured through schools as some are extensions of the program you are studying. Keep this in mind when you are thinking of where to intern overseas.
Look into an independent internship company. There are many companies that offer overseas or international internships. The Study Abroad company offers overseas internships in over 130 countries around the world. Visit their website for more information about the programs they offer.
Visit FastWeb. Known for their immense database of scholarships, grants and other financial resources for students, they also have internship resources that are worth checking out. Visit the website for more information.
Contact a company directly. If you are interested in working for a certain company or in a particular industry, contact overseas companies to learn of internship opportunities. Internships are often unpaid and you could be a great asset to the company during a hectic time. You also have the opportunity to meet important people in that company and try to position yourself for a permanent job upon graduation.