Career
Oman began his league career at Bohemians when Pete Mahon signed him in the summer of 2001. The defender was released by Bohemians in the close season between the 2005 and 2006 seasons and was immediately signed by former mentor Stephen Kenny. Oman relocated to Derry in an attempt to secure regular first team football.
On 22 November, Oman was re-signed by Bohemians after he expressed his desire to return home to Dublin.
He struggled to find form on his return to Bohemians and despite winning a League of Ireland winners medal, he found it difficult to displace the central defensive pairing of Jason McGuinness and Liam Burns. He started the 2009 season on the bench but eventually found a first team place as a result of McGuinness being suspended.
He scored some important goals during the season, including two against Saint Patrick"s Athletic on 11 August. He finished the season with two more winners medals as Bohemians reclaimed the league title and defeated Waterford United in the final of the League of Ireland Cup.
He was voted onto the PFAI team of the year for 2009.
The following year was an unsuccessful one for Oman and Bohemians. The team lost the league title on goal difference and failed to make an impact in European competition. Bohemians and Oman parted ways after the 2010 season came to an education
On 10 February 2011, Oman joined Shamrock Rovers.
In December 2012 Oman signed for the 2013 League of Ireland season. In February 2015, free agent Oman joined NIFL Premiership side Portadown on an 18-Month Contract.
In a 0-2 Defeat to Cliftonville Oman came on in the last 20 minutes for Keith O"Hara. Then, Oman as soon as play resumed, strangled Clifftonville striker Martin Donnelly to the ground much to the amusement of the home fans.
Oman made his first start on 14 March 2015 against Dungannon Swifts and was yellow carded for a challenge on Jamie Glackin.
, 2007 -10, 2013.
