You can do an initial training or skills development course in a technical field at the Centre de Formation Professionnelle et Technique Senegal/Japon (Vocational and Technical Training Centre of Senegal/Japan (CFPT)) in Dakar. You could train to become an industrial maintenance engineer. There are also skills development courses for engineers, skilled tradespeople and trainers. You can gain a range of different qualifications at CFPT.
They will advise you on the options. You will find all the information you need for your application on the website. You will have to pay a fee for the course each year.