There are the following ways to get to the hotel from JR Sendai Station.
▼Google map (Sendai Station→Onsen Sanso Daikon no Hana)
https://goo.gl/maps/Uo8sd3NzmuBc52nL7
1）Take a highway bus from JR Sendai Station
Express buses bound for Togatta Onsen are available from the bus stop No. 33 located in front of JR Sendai Station.
The nearest bus stop is the last one called "Active Resorts Miyagi Zao Mae", where it takes about 15-minute by walking from the stop to the hotel. (There is no shuttle service to and from the bus stop.)
Please refer to the following website for the details including the bus timetable.
▼ Zao Town Tourism and Products Association "Transportation Details" (Japanese only)
https://www.zao-machi.com/news/395.html
2）Take a taxi from JR Sendai Station
Taking a taxi from JR Sendai Station usually takes about 60 minutes though it depends on the road and traffic conditions.
There is no significant difference in the time required between using the expressway and an ordinary road.
(3) Rent a car from JR Sendai Station
There are some car rental companies near JR Sendai Station.
The trip usually takes about 60 minutes though it depends on the road and traffic conditions.
There is no significant difference in the time required between using the expressway and an ordinary road.
(4) Take Tohoku Shinkansen to JR Shiroishi Zao Station from JR Sendai Station and take a fixed fare cab
Click here for the access from JR Shiraishi Zao Station.
https://daikon-no-hana.tayori.com/q/question-faq-en/detail/420494/