No, there aren’t any foreign exchange programs available at IIM Shillong. It’s a relatively new IIM and lacks in this aspect.
However, the PGPEx-MBIC program is a joint program between IIM Shillong and the Ocean University of China. Under this program, the students from IIM Shillong go to OUC, China for a period of 4 months. This is part of the international immersion, which also includes a 2-month internship in China. The course is open to foreign nationals as well.