Miss Sheehan (21) and her writer mother, Pip, who lives in Cairns, Australia, produced the book last month and just three weeks after the first print run of 500 was done they have sold 210 copies.
Miss Sheehan is one of New Zealand's top slopestyle freeskiers - she competed at international level for several seasons and achieved top 10 finishes in the New Zealand, Nippon and European opens.
The former Mt Aspiring College pupil has freelanced in a variety of jobs to help fund her sport and is a well-known producer of hand-knitted woollen hats.
This week, she is volunteering as an official at the New Zealand freeski junior nationals.
In November, she will head to the US, France and Japan for the northern hemisphere season, returning home in April next year.
Sam and Lily at Cardrona is Miss Sheehan's second completed book and she is working on two other book illustration assignments.
"I love art. I did a lot of it at school. I also illustrated my first book while I was at school . . . it was one of my Mum's Australian friends. But I neglected art for my skiing."
Illustrating children's books would be a "side career" while she was competing on skifields around the world but Miss Sheehan hopes to continue developing it.
"It is good not to be so focused on skiing all the time," she said.
The idea for the children's book was sparked during a chat with Cardrona snow sports manager Bridget Legnavsky.
"So Mum and I and Bridget got together and came up with the ideas," Miss Sheehan said.
Several Cardrona identities, including Cardrona host Carol Little - well known for her colourful hair style - feature in the book.
The book was printed by The Copy Press in Nelson and costs $20.
It is available from the town and mountain offices of Cardrona Alpine Resort and arrangements are being made to stock it at Wanaka Paper Plus.
