Residence of the company?
You are asking 'am I going to be taxed on the contributions my company makes'. If the company is still resident in the UK, then 'no' simply because the UK still has primary taxing rights. If the company is no longer resident in the UK, then although the EU is in the process of obtaining EU-wide recognition of the 'pension' status of a pension that is qualified in any of the EU member states, you will probably find that Poland will not treat the UK pension as a Polish qualifying pension under the last pillar of their three pillar system. By 'probably' I mean get a local opinion, but I assume not. I would assume that Poland will not seek to tax monies rolling up inside a UK qualified pension while you are Polish resident.
It might occur to you to consider how you can sustain a UK residency of your company, and if you are a controlling director, that is quite an undertaking. If there is genuine cause for going this route, it would requires a three fold approach of control management and time. My guess is that unless your turnover exceeds 250k, probably not worthwhile.
I see that in 2019 the Polish are moving their second pillar state guaranteed pension plans to an USA-style IRA account - so there's a faint chance as the legislation unfolds your can find a way to duplicate your SIP investment strategy locally. You would have two accounts to manage, one in each country.
The SIP you have invests in one fund you say. Usually one would invest your pension in the base currency of your retirement country. If you were to retire in Poland you would probably now move your investments to a EUR base. There's not a lot to stop you looking at the investments inside the fund and simply buying them or an equivalent without paying fund fees.
The overall benefit of a pension is usually marginal compared to assets held in a family trading company. The QROP specialists may say they can help with an offshore pension, but I rarely find that's useful, given any fund fees, any of their restrictions on funds and their annual charges. But it's always an individual computation.
If there is an absolute requirement to fund the SIP then I would suggest you consider being employed by a spin off company which conducts only work in the UK, with a UK salary to you. There could be room then to continue the SIP contributions. Permit me to say check the Double Tax Treaty in case both countries want to tax such income. And once again, you have the control and management issues. Some would say 'why bother?' Just have a company based in Jersey doing all the company work not in Poland and don't bother with any pension scheme nor HMRC.
Personally I would be tempted to leave the SIP in place although change the investments, and use the company to accumulate funds in Poland.
You didn't ask about estate planning, always a rat's nest especially with their laws of succession. I mention this because both a SIP and a trading company have special treatments.