Earl Timberlake will transfer from Rock Creek Christian to DeMatha ahead of his sophomore year, Timberlake and DeMatha Coach Mike Jones told The Post on Thursday.

Timberlake suited up for DeMatha for the opening night of the DeMatha Summer League in Hyatsville, Maryland. The 2020 guard said his parents have been wanting to send him to DeMatha for a long time, and that it became official earlier this week. He averaged 8.3 points per game for Rock Creek Christian as a freshman this past season, and will now join 2020 center Hunter Dickinson and 2019 guard Justin Moore — who is still recovering from tearing his left anterior cruciate ligament in January — in DeMatha’s core.

Good kid and it’s a good fit,” Jones said Thursday. “I just think athletically and academically it’s a great opportunity for him.”

The 6-foot-5 Timberlake was a lockdown defender for Rock Creek Christian, and his offensive game is gradually expanding. He is playing for Team Takeover’s 16U team in Nike’s Elite Youth Basketball League on the AAU circuit, and has started to handle the ball more in the last two months. He currently has scholarship offers from Penn State, Kansas State, Virginia Tech and Georgetown. He took an unofficial visit to Georgetown on May 8 and received an offer directly from Coach Patrick Ewing that day.

The Stags handled Annapolis in the first of four summer league games in their gym Thursday. Timberlake flashed his ability to affect the game on both ends, scoring inside and using his length and quickness to bother opposing guards. DeMatha repeatedly lobbed the ball to him at the rim, and Timberlake used his athleticism to snatch it high in the air and finish where no defender could block him.

And on one lob, he hung above the floor long enough to draw Dickinson’s defender out of the paint. As soon as that happened, he flipped a pass to the rim and Dickinson finished a jump hook. Timberlake also worked pick-and-rolls with Dickinson throughout the game, and the pair, which played together at the start of the AAU circuit in April, looked comfortable doing so.

“I have been playing a lot of point and shooting guard right now,” said Timberlake after the game. “I struggle with that a bit because I think I’m more effective on the ball when I can handle it, but I’m getting there. I’ll get better with the balance.”

Timberlake was playing in a talented Rock Creek Christian program led by Coach Chris Cole. The Eagles are returning 2018 forward Jermaine Harris, who has been offered by a handful of high-major programs. They had 11 players average five or more points last season, and point guard Sherif Kenney and Timberlake would have formed a dynamic backcourt.

But there is also a lot of opportunity for Timberlake playing for DeMatha in the Washington Catholic Athletic Conference. Dickinson is a seven-foot center being courted by high-major programs. Before his injury this past season, the 6-foot-3 Moore ranked second on the Stags in scoring with 14 points per game and had attracted offers from Notre Dame, Xavier and Old Dominion. DeMatha, with its storied history, will send three seniors to Division I programs in the fall: D.J. Harvey to Notre Dame, Josh Carlton to Connecticut and Ryan Allen to Delaware.

Now Timberlake is ready to join the tradition.

“It’s definitely exciting,” he said. “I think this could be really, really good for me.”