Attrill polled 20 votes to finish three clear of Timboon Demons teammates Matthew Whitehead and Thomas Hunt, who tied for second with 17.
The Power veteran, 31, had 15 votes at the halfway mark and picked up the last of his 20 in round 11.
He started the season in the ruck but a brief trip to Perth mid-season, which coincided with the return of Matthew Fidge, sparked a shift forward.
Attrill said he rated his season as "pretty good".
"I knew I wouldn't get a vote after round 13," he said.
"I went to Perth and big Matthew Fidge went into the ruck.
"He was the senior ruckman in two or three premierships.
"They were a bit short on big men one week and he filled in.
"Since then I moved down forward."
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Attrill said his previous individual accolade in football was winning the Power's reserves best and fairest in 2003, the club's first season in the WDFNL.
He has tasted premiership success once, when Kolora beat Noorat to win the 2001 Heytesbury-Mount Noorat league flag.
"There are still some good players running around in the reserves," he said.
"Until now I wouldn't consider myself among the best players in the league."
Attrill, who is also a talented cricketer, said he had no plans to hang up the boots yet, hoping to play on for as long as he felt he was contributing.
"I'll keep running around in the twos until the coach tells me I'm not good enough or I'm keeping a young player out of the side," he said.
Merrivale spearhead Matthew Auld won the goal kicking award having booted 70 during a number season roaming the forward 50.