No, Secret Idol is not a goth band, because they play Hard/Punk Rock, while goth music consists of Gothic Rock and its derived genres, like Deathrock, Darkwave, Ethereal Wave, and Coldwave.

If you want to dive into the goth music scene, some of the bands that might appeal to you if you enjoy Secret Idol are 45 Grave, Diavol Strâin, and Scary Bitches.