He replaces James Tan, who left to join Levi's as regional marketing communications manager.
Chew said: "My ambition is pretty straight forward. Make adidas the number one sporting brand in Singapore."
Chew leaves his post as senior brand manager at Unilever Singapore where he headed up marketing for the Home & Personal Care Division, which included brands such as Sunsilk, Dove, Clear, Lux and Lifebuoy.
Like adidas, Unilever is the number two player in its in category in Singapore, trailing market leading FMCG firm Procter & Gamble.
Chew said that he has no plans to change adidas Singapore's agency partners, which are the globally aligned pairing of TBWA (creative) and Carat (media).