We can call these people "科技白痴", which is usually used in written form. But this word, as a noun, is not very popular in daily life, and we generally describe this meaning by using adjectives or verbs.
For example: "他对科技一窍不通！"
"一窍不通" means "don't understand at all!". So it is equivalent to say "他对科技一点也不了解！"
By the way, there is a kind of people who feature their poor abilities of self and crazy love of learning. We call them "书呆子", and they are typically technologically impaired.