While it is quite effective for mastering foreign languages to study abroad, it costs much. Its alternative is online lessons. Nowadays, online like skype can be used all over the world. Thus, language lessons by native speakers can be taken anywhere.
The Japanese language is no exception. In Sapporo, there are some Japanese language schools which provide skype lessons. For example, EJ Lounge offers 30 minutes Skype Japanese class. By applying from this website, you can take the skype lesson in your country.
If you want to study in Japan in the future, it may be a good idea to improve your Japanese-language ability to some extent in your country. If you come to study in Japan after training Japanese-language, it becomes easier to study major in Japanese and to work part-time jobs.