The anti-corruption watchdog investigated the now independent MP for Drummoyne over his lobbying of councillors to rezone blocks in Five Dock in Sydney's inner west, where his family owned property.
"The commission found that Mr Sidoti engaged in serious corrupt conduct ... between approximately late 2013 and February 2017," the report said.
The ICAC also determined "that consideration should be given to obtaining the advice of the Director of Public Prosecutions with respect to the prosecution of Mr Sidoti for the offence of misconduct in public office".
The DPP determines whether any criminal charges can be laid and undertakes all prosecutions.
Operation Witney was helmed by Chief Commissioner Peter Hall and tabled in NSW parliament on Wednesday.
It probed whether Mr Sidoti misused his position to try and improperly influence City of Canada Bay Council (CCBC) Liberal councillors to benefit his family's property interests.
It found he indulged "in a protracted course of conduct" using his position as the MP for Drummoyne "to try to improperly influence" councillors Helen McCaffrey, Mirjana Cestar and Tanveer Ahmed.
The commission found Mr Sidoti pressured and threatened councillors to try to interfere with the impartial exercise of their official functions, to further his family property interests.
Despite insisting he was acting in the interests of his constituents "the outcomes that he wanted those councillors to deliver were entirely directed to his private interest in increasing the development potential of his family's growing number of properties in and around the Five Dock town centre", the report said.
ICAC found the outcomes he was lobbying for were also inconsistent with what had been determined by the CCBC, which was informed by the recommendations of council staff as well as independent expert planning consultants "following extensive community consultation to be in the public interest".
ICAC found he engaged in a breach of public trust by "representing that he was acting at all times in the interests of his constituents and the local community".
Mr Sidoti also failed to declare his interest in family properties from the time he entered parliament in March 2011 until April 4, 2017, contrary to his obligations under the MPs' code of conduct and the ministerial code.
ICAC made 15 corruption prevention recommendations to improve the disclosure of pecuniary and private interests, and the management and declaration of conflicts of interest for MPs and "to address councillors' governance obligations, particularly in relation to lobbying, conflicts of interest and environmental planning issues".
Mr Sidoti stood aside as sports minister in 2019 after ICAC began its investigation, and later resigned from the Berejiklian government cabinet in March 2021, shortly before the public hearings began.
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