I just learned about the following two websites for people who want to work in Japan but are currently residing outside the country.
The first is Next Stage Asia, which is a website for citizens of ASEAN nations and Taiwan. Even if you are currently still a student, you can apply for internship through the website.
The next one, I saw on Facebook probably because I was viewing Next Stage Asia’s website and Facebook picked up on it, is Ninja — Next in Japan.
Please feel free to share if you do secure employment through these avenues.