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skinny
Fox
Slow reply but this isn't really true - saunas have high humidity, moisture in the environment and sweaty people which all effectively equal water, but most electric sauna heaters also have fake coals you add water to so that you can up the humidity (which makes it feel a lot more sauna like). Combined with lack of clothing the risk of electric shock increases significantly.
You don't have to comply with BS7671/part P of the UK building regs and I don't know what the Spanish rules are, but the inside of a sauna electrically speaking is a special location under the regs. Around the heater itself is zone 1, then the rest can be zone 2 (up to a metre high) or 3 (above a metre). This means controls need to be on the outside, everything needs to be IPX4 rated and good up to 125 degrees C, internal wiring should be minimal, etc. If the heater element can't be sealed it also normally shouldn't go on an RCD due to the potential for earth leakage.
IANAElectrician but it seems to me given all this DIY would be doable but would require a lot of thought and research to understand the safety and thermal principles.