If you are fluent in the Japanese language, there is some distance course for Wagashi. There are 2 ways; the one is held by the distance-learning specialist school and others are taught by directly from the master of the Wagashi. It seems easier to negotiate with the master directly compare with the school type. Here I have found the information: http://ameblo.jp/wagashiya22/entry-11950986466.html
Hope you have a good luck!