Jalen Ramsey is reminding folks he's got skills both on the gridiron AND the hardwood ... putting on an absolute dunk show during a pickup game in Miami this week.
The new Dolphins cornerback was caught on video throwin' down a bunch of impressive rim-rattlers inside of the Florida International University gym -- including one that he needed just one hand for.
Ramsey -- who was traded from L.A. to Miami back in March -- also displayed some ball-handling skills ... and even showcased a sweet jump shot too!