Each and every human being has access to the subconscious mind, in equal measure. It is like how some people do not have access to their own toenails because they cannot bend down to reach their feet probably due to a stiff back or some physical condition. When they take proper care to heal the condition they would be able to reach and trim their own toenails.
Our awake conscious mind is an extension of the subconscious mind, we are simply too engrossed with the thoughts happening in our thinking mind that we do not have the bandwidth to access the subconscious mind. What is termed as “my subconscious mind” is actually “The Awareness mind” or “the universal one consciousness”.
The subconscious mind is not just a treasure trove of information. Everything that ever happened in the universe including the birth of the universe happened in the universal one consciousness and is still happening. For example, if you watch a movie out of a recording of it saved in a pen drive, it could be said that the movie is happening right in front of me right now. What is happening to the movie when no one is watching it and it is in the pen drive? I could say that the movie continues to be happening in the pen drive all the time. Anyone can peep in and watch it any time.
This is what is happening in the universal one consciousness. It is a huge pen drive that has everything that ever happened or is happening or is going to happen in it for eternity since eternity. The present moment is actually the eternal moment because there is nothing other than this moment except for thoughts about the past and future. Simply sit to meditate and allow the thinking mind to slow down and become quiet and you will be able to bring this into awareness.
Please read the following articles as well as some of the other answers and articles in my Quora profile if you would like to delve deeper.