Winter took 34 wickets from just five Shield matches for South Australia since his debut against Victoria in February, and finished on 12 votes with Jackson Bird, just one point behind winner Chris Tremain, 13.
Hailing from Canberra, the 24-year-old claimed four five-wicket hauls and one 10-wicket match-haul, in a breakout campaign after earning his first senior contract at the start of the season. His best match figures were 10/109 against New South Wales at the SCG.
Only West Indian legend Joel Garner has more wickets, 40, after the same amount of games in a debut season for SA.
Winter said he was proud to be recognised for his performances.
"I didn't really expect to be here at the start of the season, especially when I was working at the SACA last year, and I'm humbled to be recognised in this way amongst such a strong bowling unit we have here in SA, and across the competition.
"Of course, I would have loved to have contributed to more wins for the team but we'll all be working really hard again in pre-season to get back up there."
*The Sheffield Shield Player of the Year voting system sees each standing umpire award a 3-2-1 vote to the players they adjudicated as best on ground in each match