Fiction authors choose to write under a pseudonym for a variety of valid reasons. They might be extremely private in nature. They might not want their work to be judged according to their gender, age or ethnicity. Their names might be so common as not to be memorable, or so unusual as to be difficult to spell and/or pronounce. They could be internationally known in a scientific field and wish to keep a clear demarcation between their academic and fiction work. Within their scientific field their name could be common – only distinguished by different initials or combinations of the same initials – and they might not want to involve colleagues in cases of mistaken identity. In their choice of pen names, they could try to evoke the right tone, for example one of enduring mystery.
We have been unable to ascertain with any certainty whether any or all of these reasons apply to Sanden.