If you're looking for anime similar to WAVE!! -Let's go surfing!!-, you might like these titles.
High school students Reki and Langa are hooked on one thing—a dangerous, top secret, no-holds-barred downhill skateboarding race called “S.” When Reki takes Langa, a transfer student, to the mountain where “S” is held, Langa finds himself sucked in. These colorful skaters will take you through a thrilling story of skateboard battles and unlimited possibilities!
They give off similar vibes and show the beginnings of someone coming to love an awesome sport. They both kinda make you feel like going outside and practice surfing or skateboarding. (At least it makes me want to)
Both new sports animes that came out circa 2020. SK8 is much more interesting though. But they both equally have diverse characters with interesting hobbies rather than the sports they partake in.
Youtarou Misaki finds himself lying on the beach one day. He is picked up by Arashi, who manages a restaurant called Kurage no Shokudou. When asked who he is, the protagonist tells a lie that he lost his memory — but he remembers everything, including the fact that his twin brother died.
Long ago, humans lived in the sea. However, some humans defied the Sea God and moved to the land, creating the division that now exists between Shioshishio, the Sea Village, and Oshiooshi, the village of the land. Now, four middle school students from the Sea Village, Manaka Mukaido, Hikari Sakishima, Chisaki Hiradaira, and Kaname Isaki must attend Mihama Middle School on the surface. While getting used to their new lives, these four and their new friend from the surface, Tsumugu Kihara, learn how true bonds of love and friendship can overcome any separation.
Goro Honda is a little boy who is obsessed with baseball. As a child, he watches his father, a professional baseball player, be removed from the Blue Oceans’ main team due to a shoulder injury that left him unable to pitch again. However, since his son looks up to him more than anyone else in the world of baseball, Goro's father decides that he can't quit just yet (as pitching is not the only way to be able to play baseball!). With his father's shining example, Goro decides to never give up as well, working his way into the Japanese Little League as a force to be reckoned with!
Makoto Tsukimoto (nicknamed Smile) is a quiet high-schooler who's been friends with the loud and energetic Yukata Hoshino (nicknamed Peco) since childhood. They're both in the local table tennis club and both have a natural talent for it, although Smile's personality always enables him from winning against Peco. The club teacher, however, notices Smile's talent and tries to make him gain some sportive tenacity.