CSSN was established in 2008 to serve Christian Schools. Before the establishment of CSSN Victorian Christian Schools met together for Athletics and Swimming competitions in Maryborough each March on the local oval and at the local swimming pool. There was a need for a more formal, elite competition that reached more Christian Schools to select teams for National Competitions.
In 2008, CSSN had 22 member schools that participated in Primary Cross Country, Secondary Athletics, Secondary Swimming and Secondary Cross Country.
Founding members of CSSN were:
Bairnsdale Christian College
Ballarat Christian College
Belgrave Heights Christian School
Chairo Christian College – Drouin Campus
Chairo Christian College – Pakenham Campus
Creek Street Christian College
Flinders Christian Community College – Carrum Downs Campus
Flinders Christian Community College – Latrobe City Campus
Flinders Christian Community College – Tyabb Campus
Heatherton Christian College
Hillcrest Christian College
Lighthouse Christian College
Maranatha Christian School – Casey Campus
Melton Christian College
Mildura Christian College
Mt Carmel Christian College
Northside Christian College
Shepparton Christian College
Victory Christian College
Waverley Christian College – Wantirna South Campus
At the end of 2008, Bairnsdale, Henderson, Mildura and Shepparton withdrew from CSSN due to distance from Melbourne where the major carnivals were conducted.
Heathdale Christian College joined CSSN at the start of 2009. A weekly sport competition was introduced for schools in south east Melbourne, along with VCE Rally Days, that were well attended. Both Primary Athletics and Primary Swimming were held for the first time.
At the end of 2009, Flinders Tyabb withdrew from CSSN.
Weekly Sport changed to fortnightly sport in 2010 at the request of schools and this system remains in place today.
Kerang joined CSSN at the start of 2010. Waverley (Narre Warren campus) along with Maranatha (Cardinia campus) joined CSSN in 2013.
In 2013, cultural activities were introduced to the CSSN annual program. Chess, Debating, Theatre Sports and Play in A Day were conducted in response to schools requests. 2014 saw the introduction of Mastercook, following on from the success of similar television programs.
St Andrews Christian College joined CSSN at the beginning of 2014, bringing the membership to twenty two schools. The other significant development for the year was the CSSN website. This advance has seen the ease of information distribution to schools, as well as an efficient online fixture / results / ladder system for Term Sport.
Red Rock Christian College and River City Christian College joined in 2015. Music was introduced into the program.
In 2016, CSSN became CSEN to recognise the cultural events that form part of the network and a new logo was adopted after a competition among schools. Rivercrest Christian College became members of CSEN.
Edinburgh College became members in 2020 and the first Robotics competition took place.