It's pretty easy to get to Yong Pyong Ski Resort due to the efficient bus system of Korea.
All buses here seem to run on time and it's pretty easy to purchase ticket, provided you know how to pronounce the name of the place you're going!
I travelled to Yong Pyong from Sokcho on my last trip. You can travel to Yong Pyong too, even if you are departing from Seoul or Yang Yang International Airport.
All you need do is to go to Kang Nung Express Bus Terminal and catch a bus to Hwengye. Once you're in Hwengye Bus Terminal, just stand by the side of the road to wait for a gigantic green bus that says " Yong Pyong Resort".
Just for convenience sake, I've attached the bus schedule here. Hope you find it handy:
1) Sokcho intercity bus terminal
Daily every 10minutes
Travel Time: 1hour and 20minutes to 4minutes
every15-20min / 2,000won /30min
3)Hwenggye->Yong Pyong Ski Resort
First5:30-Last23:30 / every 30-1hour /Free /10min
There's a free shuttle bus from Yong Pyong to the little town of Hwengye . It stops right at the express bus terminal and the bus schedule is pasted at the recep of the terminal itself.