He signed a two-year contract with Persepolis on 9 June 2013. He made his debut in a match against Tractor Sazi as a substitute for Gholamreza Rezaei and made an assist two minutes later for Mehdi Seyed Salehi. In his first season with Persepolis he was instrumental in their success and was one of their most important players. In August 2014 Sadegian was banned three months for shoving a referee during a match against Foolad. He was fired by Persepolis on 27 April 2015 after a dispute with coach Branko Ivanković.
On 1 July 2015, Sadeghian joined Naft Tehran on a five-year contract. He scored his first goal for the club on 27 October 2015 in a 2–1 victory against Padideh.
After falling out with the management at Naft, Sadeghian left the club and on 8 January 2016 he signed with Saba Qom and reunited with former coach Ali Daei.
On 28 May 2016, Sadeghian signed with newly promoted Tabrizi side Machine Sazi. This club also is his father's team. Sadeghian assisted in his first match for the club against Foolad.
On 30 August 2017, Sadeghian signed a three–year contract with Turkish club Osmanlıspor. On 4 November 2017, Sadeghian made his first appearance for the club in a match against Fenerbahce, coming on as a second-half substitute and immediately contributing an assist. Sadeghian made his second appearance on 28 November 2017 in a Turkish Cup match, he played 85 minutes and recorded two assist. In his first five matches for the club, Payam recorded four assists. Three in the cup and one in the league. Sadeghian scored his first goal for the club on 3 March 2018 from a penalty kick against Kasimpasa.
International career
Under-17
He captained the team to the championship for the first time in the 2008 AFC U-16 Championship. At the tournament he played in all the games apart from the final due to suspension. He scored Iran's first goal at the tournament against Bahrain. Winning the tournament qualified Iran for the 2009 FIFA U-17 World Cup, Sadeghian again scored Iran's first goal at the tournament against Gambia in the 44th minute making the most from a poorly taken free kick from the goalkeeper. He played a key role in Iran's qualification from its group, unbeaten with 7 points.
Under-20
He was again a vital part of Iran's U19's participation at the 2010 AFC U-19 Championship. He played in Iran's first two games, Iran losing both and failing to qualify from its group.
Under-22
He was called up by Ali Reza Mansourian to participate in the team's training camp in Italy. During a friendly match against the Italy B team he scored 2 goals in Iran's 6-2, including Iran's first with an outstanding free kick.
Senior
Sadeghian made his debut for the senior Iran team against Mozambique, as a substitute in 2012. He was called up again to the squad by Carlos Queiroz in March 2014, and played in Iran's match against Kuwait which Iran won 3-2.
