Law enforcement sources tell us the 24-year-old -- who's been in L.A. training for the NBA this summer -- had his place broken into earlier this month.

But, we're told cops described the scene as "amateur hour" ... because the burglars left jewelry and other valuables in the heist, and only took about $1,000 worth of the stuff instead.

We're told the thieves stole a pair of Wiggins' casual Nikes and his luggage -- and also made off with his rental SUV Escalade. But, we're told authorities were able to locate the vehicle a short time later.

As for Wiggins' property, the LAPD is currently investigating ... but no arrests have been made, and his stuff hasn't been recovered yet.

By the way, sources close to the situation also tell us the break-in appears to have had nothing to do with the string of burglaries that impacted celebs in the city over the past year -- describing this incident as random.

Wiggins has been one of the Minnesota Timberwolves' best players since entering the NBA in 2014 ... starting in 400 games in his 5-year career.