There are some around (I remember seeing something on rare input methods). But most people, native speakers included, use romaji input method. Second most popular is direct kana input. Radical/handwriting methods for unfamiliar kanji you need to look up only.
Imo you'd be better off learning to type the way most native speakers do, which is a useful skill by itself. If you feel the need for writing practice other than pen and paper, there are smartphone apps and ds games and so on.