Adelaide-headquartered Think180 was founded in 2007 with a focus on mining, oil and gas, renewables, and construction.
It provides systems, applications and products in data processing, helping energy companies and miners adopt software and analyse data across their operations.
KPMG said the acquisition would build its mining and energy business and clientele.
Think180 boasts major clients including Powerlink Queensland, SA Power Networks, and other utilities companies.
"SAP is a world leader in business technology and KPMG is investing heavily in growing our offerings in this space," KPMG Australia chief executive Andrew Yates said.
"By combining KPMG's capabilities alongsideThink180's, we are creating one of the leading SAP Intelligent and Enterprise Asset Management specialist teams in Australia."
Think180 co-founders John Schultz and Stephen Silver will join KPMG as partners, with their co-founder Peter Butler to join as a principal director.
Their teams in Adelaide, Brisbane, Sydney and Melbourne will merge with KPMG's existing SAP technology team under partner Pauline Doherty.