It is implied that Sandy started her karate training during her time in Texas. Her proficiency suggests years of dedication and practice.

Sandy quickly demonstrates her karate skills by protecting SpongeBob from a clam in her introduction episode.

Sandy regularly spars with SpongeBob, using the opportunity to hone her skills and teach SpongeBob basic self-defense. These sparring sessions often lead to humorous situations and property damage.

While not a frequent occurrence, Sandy sometimes participates in karate tournaments or competitions, showcasing her advanced skills and competitive spirit. These events highlight her mastery of martial arts.

Sandy occasionally utilizes her karate skills to resolve conflicts or overcome obstacles, demonstrating the practical applications of her martial arts training.