In his third year as Head Coach for Coker, Antoniewicz's team scored 6-2-9 overall and 5-0-6 in South Atlantic Conference play with a South Atlantic Conference post-season appearance against LMU. During the 2022-23 season Antoniewicz coached seven SAC All-Conference players consisting of Gustavo Palmieri, Celestin Blondel, Che Richards, Matty Tricker, Frederic Benedix, Nikola Sotra, and Jasper Rump. Gustavo Palmieri was also named the SPC Credit Union Athlete of the Month. 

In 2021, coach Antoniewicz led his team to the South Atlantic Championship, where they took down Mars Hill in a 2-1 victory. Fokam-Sandeu was named the tournament's Most Valuable Player.  In the same year, the team made history as they were nationally ranked numerous times, were as high as #4th in the nation, and held it for several weeks. Jaques Fokam-Sandeu was named to the South Atlantic Conference Preseason All-Conference First Team.  Jaques Fokam-Sandeu was named to the South Atlantic Conference Preseason All-Conference First Team. 

Michael Antoniewicz led the Cobras to a solid season in his first year at the helm, as the Cobras went 10-8 and 5-5 in the South Atlantic Conference. Coker upset No. 16 Lander 1-0 on Sept. 25, which propelled them to their first national ranking since 2012 when they cracked the next week's United Soccer Coaches national poll at No. 15. Coker played its way into the South Atlantic Conference tournament as the No. 8 seed, going on the road to upset top-seeded Carson-Newman 5-1 and advancing to the SAC tournament semifinals. Coker would have three players selected to the All-Conference Teams in Christian Provenzano (First Team), Jacques Fokam-Sandeu (First Team) and Robi Obrstar (Second Team), while Provenzano was also named to the United Soccer Coaches All-Region First Team. the men's soccer program excelled in the classroom as well, with Riccardo Ricci winning the South Atlantic Conference's Elite 20 Award for the highest GPA, and also being named a CoSIDA Academic All-District First Team selection and later a CoSIDA Second Team Academic All-American®. Men's Soccer also had a solid year in the classroom, posting a 3.44 team GPA for the year and also had 17 men selected to the 2019-20 SAC Commissioner's Honor Roll. Men's Soccer also finished sixth in all of Division II in community service hours. 

Antoniewicz was named the new Head Men's Soccer Coach at Coker on Dec. 21, 2018.

Antoniewicz makes his way to Hartsville after spending the last three years as the assistant men’s soccer coach at Truett McConnell University, in which he assisted in all aspects of the day-to-day operations. During his time at Truett McConnell, Antoniewicz helped guide the Bears to a 32-20-3 record. Antoniewicz helped lead the Bears to their first ever Appalachian Athletic Conference Championship and first ever NAIA tournament appearance in 2017 after finishing the season with a record of 16-4-2.

His duties as assistant soccer coach at Truett McConnell include being the head of recruiting, compiling scouting reports, running training sessions, field maintenance, and player management on and off the field. Antoniewicz also aided international students with their student visa process and the NAIA eligibility process, while also handling off campus evaluations, campus visits, and social media development projects.

Along with his work at Truett McConnell, Antoniewicz served as an academy coach for the 2018 MLS Cup Champions Atlanta United and the head coach of the Lanier Soccer Academy. He has coached some of the top soccer prospects in Georgia during his time in the Atlanta United Academy, leading training sessions throughout the academy system. He also holds a USSF Level D License.

Antoniewicz graduated from Truett McConnell in 2016 with a Bachelor of Science in Business with a concentration in Sports Management and is currently pursuing Master of Business Administration. He is a native of Kirkcaldy, Scotland and is the husband of Brianna Antoniewicz.