The 47-year-old will come on board on April 25 and be based at head office in Kuala Lumpur, Malaysia.
It comes after William Mitchell, as previously announced, is retiring from the company, which specialises in naturally-derived sweetener stevia.
PureCircle chairman Paul Selway-Swift said: "The group has major long term growth plans and we are delighted to have secured the services of Rakesh Sinha to support and help lead those plans.
"We believe he will bring to PureCircle a great combination of relevant industry knowledge, proven international experience, strong leadership to our finance team and a valuable contribution to our board."
He is currently CFO (Latin America, South and Eastern Europe) at Unilever Food Solutions.