By car
While there are highways linking Shikoku with Honshu, they are expensive -- around �5,000.
By plane
Prefectural capitals Takamatsu, Matsuyama, Kochi and Tokushima all have small regional airports. Matsuyama has flights to Seoul and Shanghai, while Takamatsu fields a few flights a week to Seoul. For any other international destinations, you will likely have to connect via Tokyo or Kansai.
By train
Shikoku is not connected to the Shinkansen network, but there are frequent connections from Okayama on Honshu to Takamatsu and from there on throughout the island. The limited express Shiokaze runs back and forth betweeen Okayama and Matsuyama roughly every hour during the day, skipping some stations on the way, if you feel like a more direct connection to that side of the island. The pace on Shikoku being what it is, don't come there expecting any of the trains to be super fast. It would also be wise to remember that train information will be in Japanese only, unlike what you may be used to from the Shinkansen. So either be sure to brush up on your knowledge of terms such as "unreserved seats" and the names of the places you're planning to visit, in kanji, or plan to ask a lot of people (which may be more fun, but may also take more time).
By bus
If coming from Kansai or eastern parts of Japan, buses through Awaji Island are the fastest way of getting to Shikoku.
By boat
There are numerous ferries that run to Shikoku that can be taken from major cities like Kobe and Hiroshima. From Hiroshima to Matsuyama expect to spend 2700 yen. The ferry takes around 2 and a half hours
