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The most popular World Cup sport by far is Soccer (Football), with the FIFA World Cup attracting billions of viewers and being the world’s most-watched sporting event, followed by major tournaments in Cricket, Basketball, and Rugby, all commanding massive global followings, especially in specific regions, alongside large multi-sport events like the Olympics. 
Here’s a breakdown of the top contenders:

Soccer (FIFA World Cup): The undisputed #1, with the 2022 final watched by over 1.5 billion people and the tournament reaching around 5 billion viewers in total, making it the planet’s biggest sporting event.
Cricket (Cricket World Cup): A huge global sport, especially in Asia, Australia, and the UK, with billions of fans and major viewership for its World Cup, notes 
sportsvenue-technology.com

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Basketball (FIBA Basketball World Cup): Ranks highly with a massive fanbase, particularly strong in the Americas, Europe, and Asia, according to Topend Sports.

Rugby (Rugby World Cup): A significant event, especially in Commonwealth nations, with the 2023 final drawing over 800 million viewers, notes uhomes.com.

Field Hockey: Often overlooked in Western media, it boasts a massive 2 billion fans, especially across Asia, Europe, and Australia, reports Sports Venue Technology.

Tennis: Popular worldwide with big followings for its Grand Slam tournaments and stars, according to gourmiz.ch.