Baird, a former NSW premier, had served on the Cricket NSW board before becoming CA chair in 2023. He found himself at odds with Australia's largest state over BBL privatisation and the game's financial model, according to the state's cricket body.
Cricket NSW, chaired by John Knox, informed Baird last week that it had withdrawn support for him to continue as its nominee for another three-year term. The state also rejected a proposal for Baird to move into an independent director's spot, recently vacated by Sarah Adam-Gedge, while a new chair was found.
Boon, a decorated former Test batsman, will lead the governing body on an interim basis, taking on the role at CA's AGM next month.
The resignation follows growing discontent over the proposed sale of BBL clubs. Former CA chair Wally Edwards spoke out at Cricket Western Australia's AGM last week, opposing the sale and calling for the CA board to be spilled by the states.