Take a bus from Morchit Bus Station in Bangkok. Choose the bus company called "Air Muang Lei" (In Thai: แอร์เมืองเลย), Ticket Booth #6-7 at Morchit, Tel: 02-9360142.
Get off at "Amphor Keng Krow, Chaiyaphum." (แก้งคร้อ ชัยภูมิ). The bus leaves every hour from 6.00 to 22.30. It takes 6 hours.
From Keng Krow, you may take a motorcycle taxi to Wat Pa Sukato, Tha Mafai Wan. Motorcycle taxi drivers wear bright-color vests and they are near where the bus drops you off. About 30 minutes to Sukato.