He was a member of the Belgian professional cycling team Veranda's Willems-Crelan.
Before taking him to the hospital, Goolaerts was even administered a CPR treatment on the side of the road.
The Paris-Roubaix race was won by world champion Peter Sagan.
Goolaerts was initially stated to be in a "life-threatening condition after suffering a cardiac arrest" in an earlier statement by race organisers. "We share their enormous sadness", Mr Lappartient wrote on Twitter.
Sagan, the three-time world champion from Slovakia, and Dillier rode together at the front for the last 25 kilometres (15.5 miles). His most significant result this season was 20th at Kuurne-Brussels-Kuurne.
"No update on Michael Goolaerts yet", the team later said in a statement. "Such a sad news".
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The 257km race is also known as the "Hell of the North" because of its treacherous profile including 54.5km of cobblestones spread out over 29 sectors.
Two years ago, Belgian cyclist Daan Myngheer, died at the age of 22, two days after having a heart attack on the Criterium International in Corsica.
On Sunday the Paris Roubaix race went without Goolaerts and entire world victor Peter Sagan became the first rider as 1981 to claim the Queen of the Classics using all the rainbow jersey on his own shoulders.
Another Belgian cyclist, Antoine Demoitie, died the same year following a crash in the Gent-Wevelgem race.
American Chad Young and France's Mathieu Riebel died from head injuries in crashes on descents during the Tour of Gila and Tour de Nouvelle Caledonie in 2017 respectively.
Nairo Quintana, a previous victor of the Giro d'Italia and Vuelta, tweeted: "Upset about the death of Michael Goolaerts today in #ParisRoubaix".