I published several post about the limited express trains to Sanin area, such as Super Oki, Super Matsukaze, Super Inaba, Super Hakuto and Hamakaze. But there are some more trains from Osaka and Kyoto to Kinosaki-Onsen area. And there are several gateway stations. You might be confused.
Limited Express Super Oki (スーパーおき) is operated between Tottori (鳥取), Yonago (米子) and Shin-Yamaguchi (新山口). This train connects all major cities in Sanin area with Shinkansen station Shin-Yamaguchi. Especially you can access to west part of Sanin area, such as Masuda (益田), Hamada (浜田), Odashi (大田市) where is UNESCO World Heritage Iwami Ginzan Silver Mine gate station, this train is your choice. And you can use this train for transfer among Matsue (松江), Izumoshi (出雲市) and other cities in Sanin area. Other limited express Super Matsukaze is operated between Tottori and Masuda. You can use both trains for inter-city transfer in Sanin area. Moreover don’t forget than Tsuwano (津和野) is on the way. This small town is called “Sanin’s little Kyoto”.
Limited Express Super Inaba (スーパーいなば) connects Okayama (岡山) with Tottori (鳥取). It is connected with Shinkansen and Sunrise Izumo/Sunrise Seto. This is the fastest access to Tottori from Tokyo by Sunrise Seto and Sunrise Izumo. If you access to Tottori from Okayama and to the west from Okayama, such as Hiroshima, Hakara and all places in Kyushu and Shikoku. But this train goes through non JR line, Chizu Kyuko Railway. It is operated on same route as Super Hakuto between Kamigori and Tottori. That means you need to pay extra if you use this train by Japan Rail Pass. If you don’t want to pay extra, get on Limited Express Yakumo from Okayama to Yonago and transfer to another Limited Express Super Matsukaze or Limited Express Super Oki to Tottori. However travel time of this combination is at least 1.5 hours longer than Super Inaba. Sometimes it may take more because of connection at Yonago.
Sunrise Izumo is an overnight train which runs between Tokyo and Yonago, Matsue and Izumo-shi in Sanin area. This train is combined with Sunrise Seto between Tokyo and Okayama.
This train has many kinds of accommodations. One of these is called “Nobi Nobi Seat” which is like carpet section. This Nobi Nobi Seat is fully covered by JR pass. This is not very comfortable but you can lie on the seat. And you have some privacy because there is a small partition between the sections.