See the resource section of this handout for directories of internships. The International Center has every directory of international internships in print. The majority of overseas internship programs are sponsored by universities. For undergraduates these are the among the most easily available options. Advantages of these include credit, applicability of financial aid, and a wide variety of subjects and locations available.
Disadvantages are cost and sometimes unpredictability of placement.
Hundreds of internships are available through other universities. The International Center can usually put you in touch with appropriate advisers in each of the professional schools. A few reciprocal exchange programs offer paying internships in applied fields. The program is available for Britain, Ireland, France, Germany, Canada, Costa Rica, Australia and New Zealand. CDS can also help individuals obtain work permits for Germany, Switzerland, and Singapore once they have secured a position.