Hello kitty train

Can I use Sanyo Sanin Northern kyushu pass to ride the hello kitty train from hakata to osaka?

Yes, but be aware that there is only one train a day, it runs most but not every single day, and the train is a Kodama train which stops at every single bullet train station, making the ride much longer (4 hrs 20 min). Departure time is just after 7 AM from Hakata Station.
https://www.jr-hellokittyshinkansen.jp/en/
https://www.westjr.co.jp/global/en/ticket/pass/ssnk/