The Givealittle page said he was passionate about the outdoors, and died doing what he loved.
Friends have paid tribute to Kerr on Facebook, saying a tragedy had claimed the life of a "lovely, genuine guy".
"Dear Sam, we all loved your smile and massive heart - you will be sorely missed. Dear Yuka and Rui, please hang in there - we are here to help," said Ben Clark.
Bevan Colless said the Niseko community will come together to support Kerr's family.
"Say it's not so. Such a great person with an infectious energy and love for life. No one ever had a bad word to say about him. RIP Sam. The Niseko community will come together to help your family."
Others have thanked Kerr for unforgettable "good times" spent in the snow.
A spokesperson for the Ministry of Foreign Affairs and Trade said: "The Ministry is aware of the death of a New Zealander in Hokkaido.
"The New Zealand Embassy in Tokyo has offered consular assistance to the family of the deceased."