There are only a handful of programs that cater entirely to eastern forms of bodywork. The aobta has a list here and the one that is closest to you (MA) (and the only one in the area with a full eastern bodywork focus) is the shiatsu program at karuna healing arts center.
Outside of what you -want- to learn you also need to be concerned with where you may want to practice and be aware of the requirements in those areas. Some states will not offer massage licenses to those with shiatsu training (sometimes it's an hours issue), some require lots of hours and have very specific requirements and others have little or no regulation. So find some schools that you are interested in and talk with their admissions program and other students about potential issues with licensure.
If you are deeply interested in eastern medicine, acupuncture school (while far more time and finance intensive) is an ideal way to get the required training.