"Security has never been more critical for organisations and we welcome Sean's insight and leadership in providing clarity and support to our customers and partners", said Zscaler APJ vice-president Scott Robertson.
"His new business development experience across the Asia Pacific region will be invaluable in developing strategies that will successfully engage with customers and partners across the Australian and New Zealand markets."
Kopelke brings more than 20 years' experience to the company.
Kopelke previously spent a decade with Symantec, culminating in the role of senior director of ANZ sales specialists and technical sales organisation. He joined the company as a result of its acquisition of Veritas.
Earlier in his career, Kopelke worked in the systems engineering field for Boral, Mincom and KVS.
Between 2013 and 2015 he served as chairman of the SNIA ANZ board.